{"id":131746,"date":"2020-09-21T11:01:47","date_gmt":"2020-09-21T11:01:47","guid":{"rendered":"https:\/\/dievolkswirtschaft.ch\/2020\/09\/lein-alvarez-10-2020fr\/"},"modified":"2023-08-23T23:57:37","modified_gmt":"2023-08-23T21:57:37","slug":"lein-alvarez-10-2020fr","status":"publish","type":"post","link":"https:\/\/dievolkswirtschaft.ch\/fr\/2020\/09\/lein-alvarez-10-2020fr\/","title":{"rendered":"Un indice des prix en temps r\u00e9el"},"content":{"rendered":"<p>La pand\u00e9mie de Covid-19 a provoqu\u00e9 une r\u00e9cession mondiale<a href=\"#footnote_1\" id=\"footnote-anchor_1\" class=\"inline-footnote__anchor\">[1]<\/a>. Il s\u2019agit d\u00e9sormais de d\u00e9terminer l\u2019ampleur et la pr\u00e9valence respectives des chocs d\u2019offre et de demande. Les responsables de la politique \u00e9conomique ont en effet besoin de savoir si la r\u00e9cession est due \u00e0 une faiblesse de la demande ou \u00e0 une restriction de l\u2019offre. Comme en m\u00e9decine, le m\u00eame sympt\u00f4me peut provenir de maladies diff\u00e9rentes et la bonne th\u00e9rapie pour un diagnostic donn\u00e9 peut s\u2019av\u00e9rer mauvaise pour un autre. Pour contrecarrer un choc de la demande, le rem\u00e8de ad\u00e9quat sera par exemple un plan de relance \u00e9conomique stimulant la demande ou un assouplissement de la politique mon\u00e9taire. Face \u00e0 un choc de l\u2019offre, en revanche, de telles mesures ne font qu\u2019attiser l\u2019inflation et ont relativement peu d\u2019impact sur l\u2019\u00e9conomie r\u00e9elle.&#13;<br \/>\n&#13;<br \/>\nUne indication de l\u2019ampleur relative des chocs de l\u2019offre et de la demande est la variation du niveau des prix, c\u2019est-\u00e0-dire l\u2019inflation. Si les prix augmentent, c\u2019est le choc de l\u2019offre qui l\u2019emporte\u00a0; s\u2019ils baissent, c\u2019est le choc de la demande. Il est donc essentiel de conna\u00eetre l\u2019ampleur des variations de prix \u00e0 l\u2019heure actuelle.&#13;<br \/>\n&#13;<br \/>\nDes statistiques comme l\u2019indice des prix \u00e0 la consommation (IPC), publi\u00e9 chaque mois par l\u2019Office f\u00e9d\u00e9ral de la statistique (OFS), sont g\u00e9n\u00e9ralement les plus utiles. Mais pendant la p\u00e9riode du semi-confinement, de mi-mars \u00e0 d\u00e9but mai, quand des milliers de produits n\u2019\u00e9taient pas disponibles, certains de ces chiffres dont on avait un urgent besoin faisaient d\u00e9faut. Dans les cat\u00e9gories \u00ab\u00a0Habillement et chaussures\u00a0\u00bb et \u00ab\u00a0Restaurants et h\u00f4tels\u00a0\u00bb, seuls 25\u00a0\u00e0 75\u00a0% des s\u00e9ries de prix habituelles ont ainsi pu \u00eatre collect\u00e9s. Pour les autres secteurs, l\u2019OFS utilisait les prix en ligne quand ils \u00e9taient disponibles<a href=\"#footnote_2\" id=\"footnote-anchor_2\" class=\"inline-footnote__anchor\">[2]<\/a>.&#13;<br \/>\n&#13;<br \/>\nPour rem\u00e9dier \u00e0 cette carence statistique, une \u00e9tude a calcul\u00e9 ce printemps un indice sur une base quotidienne qui a suivi l\u2019\u00e9volution des prix en temps r\u00e9el<a href=\"#footnote_3\" id=\"footnote-anchor_3\" class=\"inline-footnote__anchor\">[3]<\/a>. L\u2019indice couvre certaines cat\u00e9gories de l\u2019IPC et porte sur les prix de plus de 75\u00a0000\u00a0produits propos\u00e9s sur les sites web de divers commerces en ligne. Cette approche est particuli\u00e8rement int\u00e9ressante pour la dur\u00e9e du semi-confinement, puisque de nombreuses d\u00e9penses de consommation n\u2019ont pu s\u2019effectuer ce printemps que par l\u2019interm\u00e9diaire d\u2019Internet. Les achats en ligne ont par cons\u00e9quent doubl\u00e9 par rapport \u00e0 la m\u00eame p\u00e9riode l\u2019ann\u00e9e pr\u00e9c\u00e9dente<a href=\"#footnote_4\" id=\"footnote-anchor_4\" class=\"inline-footnote__anchor\">[4]<\/a>.&#13;<\/p>\n<h2>Les prix sur une base journali\u00e8re<\/h2>\n<p>&#13;<br \/>\nLe nouvel indice a combin\u00e9 les prix en ligne avec les pond\u00e9rations des cat\u00e9gories de biens incluses dans l\u2019IPC et calcul\u00e9 leurs variations gr\u00e2ce aux informations sur les <a href=\"http:\/\/monitoringconsumption.org\/switzerland\">d\u00e9penses quotidiennes par carte de d\u00e9bit<\/a>, \u00e9galement disponibles en temps r\u00e9el. Il peut \u00eatre mis \u00e0 jour quotidiennement et livre \u00e0 la fois les prix et les d\u00e9penses en temps r\u00e9el. Ces prix sont ainsi disponibles jusqu\u2019\u00e0 cinq semaines avant l\u2019IPC officiel, ce qui peut constituer un gain de temps pr\u00e9cieux en p\u00e9riode de crise.&#13;<br \/>\n&#13;<br \/>\nIl existe plusieurs m\u00e9thodes pour calculer les indices de prix\u00a0; l\u2019\u00e9tude en a choisi trois diff\u00e9rentes. La premi\u00e8re, l\u2019indice de Laspeyres, donne l\u2019\u00e9volution du prix d\u2019un panier de biens repr\u00e9sentatif fixe. La variation (en pourcentage) des d\u00e9penses n\u00e9cessaires pour acheter ce panier mesure l\u2019inflation pendant la p\u00e9riode sous revue. L\u2019IPC est calcul\u00e9 selon cette m\u00e9thode.&#13;<br \/>\n&#13;<br \/>\nLe deuxi\u00e8me indice est celui de Paasche. Il montre ce que le panier de biens actuel aurait co\u00fbt\u00e9 dans le pass\u00e9. La diff\u00e9rence correspondante est une autre mesure de l\u2019inflation. Le troisi\u00e8me indice, dit \u00ab\u00a0de Fisher\u00a0\u00bb, est une moyenne g\u00e9om\u00e9trique des deux premiers. Il est g\u00e9n\u00e9ralement consid\u00e9r\u00e9 comme le moins \u00ab\u00a0fauss\u00e9\u00a0\u00bb. Les distorsions des indices de Laspeyres et de Paasche sont dues au fait que les consommateurs remplacent g\u00e9n\u00e9ralement les biens les plus chers par d\u2019autres, moins co\u00fbteux.&#13;<br \/>\n&#13;<br \/>\nL\u2019\u00e9tude a montr\u00e9 que l\u2019indice de Fisher refl\u00e9tait relativement bien l\u2019IPC dans les mois pr\u00e9c\u00e9dant la crise, m\u00eame si seuls 24\u00a0% du panier de l\u2019IPC ont \u00e9t\u00e9 remplac\u00e9s par des prix en ligne (voir <em>illustration<\/em>\u00a0<em>1<\/em>). Les prix saisis quotidiennement fluctuent naturellement davantage que ceux de l\u2019IPC sur une base mensuelle. Dans l\u2019indice nouvellement calcul\u00e9, certaines rubriques du panier de l\u2019IPC \u2013\u00a0comme les loyers, qui repr\u00e9sentent 20\u00a0% du panier\u00a0\u2013 restent telles que publi\u00e9es dans l\u2019IPC, sachant qu\u2019elles ne fluctuent gu\u00e8re au quotidien et qu\u2019elles pouvaient continuer \u00e0 \u00eatre collect\u00e9es pendant le semi-confinement. Les auteurs de l\u2019\u00e9tude ont en outre pu montrer que les donn\u00e9es en ligne refl\u00e9taient bien les informations hors ligne des cat\u00e9gories qu\u2019ils ont remplac\u00e9es. La corr\u00e9lation ne s\u2019explique donc pas seulement par les cat\u00e9gories qui n\u2019ont pas \u00e9t\u00e9 remplac\u00e9es.&#13;<\/p>\n<h3 class=\"text__graphic-title\">Ill. 1. Indice de l\u2019\u00e9tude compar\u00e9 \u00e0 l\u2019IPC (mai\u00a02019 \u2013\u00a0juillet\u00a02020<strong>)<\/strong><\/h3>\n<p>&#13;<br \/>\n<div class='chart chart--normal' id='Lein_Alvarez_Abb1_FR'>\n\n<\/div>\n\n<script>\n$(function () {\n    $('#Lein_Alvarez_Abb1_FR').highcharts({ \n\n\n  chart: {\n    type: 'spline'\n  },\n  title: {\n    text: ''\n  },\n\n  xAxis: {\n    plotLines: [{\n            color: 'black',\n            width: 1,\n            value: Date.UTC(2020, 2, 16), dashStyle: 'ShortDash'\n\n        },{\n            color: 'black',\n            width: 1,\n            value: Date.UTC(2020, 3, 27), dashStyle: 'ShortDash'\n\n        },{\n            color: 'black',\n            width: 1,\n            value: Date.UTC(2020, 4, 11), dashStyle: 'ShortDash'\n\n        }],\n    type: 'datetime',\n    title: {\n      text: ''\n\n    },\n  \n  },\n\n\n  yAxis: [{ \/\/ Primary yAxis\n    labels: {\n      format: '{value}%',\n\n    },\n    title: {\n      text: '',\n\n    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C(\t2020,\t2,\t16\t),\t-0.017234746\t],\n[Date.UTC(\t2020,\t2,\t17\t),\t-0.011601548\t],\n[Date.UTC(\t2020,\t2,\t18\t),\t-0.032172352\t],\n[Date.UTC(\t2020,\t2,\t19\t),\t-0.064959191\t],\n[Date.UTC(\t2020,\t2,\t20\t),\t-0.095295034\t],\n[Date.UTC(\t2020,\t2,\t21\t),\t-0.128703818\t],\n[Date.UTC(\t2020,\t2,\t22\t),\t-0.16961129\t],\n[Date.UTC(\t2020,\t2,\t23\t),\t-0.209047705\t],\n[Date.UTC(\t2020,\t2,\t24\t),\t-0.217013866\t],\n[Date.UTC(\t2020,\t2,\t25\t),\t-0.226269171\t],\n[Date.UTC(\t2020,\t2,\t26\t),\t-0.219251469\t],\n[Date.UTC(\t2020,\t2,\t27\t),\t-0.202590287\t],\n[Date.UTC(\t2020,\t2,\t28\t),\t-0.189576045\t],\n[Date.UTC(\t2020,\t2,\t29\t),\t-0.17306444\t],\n[Date.UTC(\t2020,\t2,\t30\t),\t-0.156158209\t],\n[Date.UTC(\t2020,\t2,\t31\t),\t-0.133570164\t],\n[Date.UTC(\t2020,\t3,\t1\t),\t-0.183147132\t],\n[Date.UTC(\t2020,\t3,\t2\t),\t-0.233551979\t],\n[Date.UTC(\t2020,\t3,\t3\t),\t-0.277718842\t],\n[Date.UTC(\t2020,\t3,\t4\t),\t-0.318537951\t],\n[Date.UTC(\t2020,\t3,\t5\t),\t-0.363104731\t],\n[Date.UTC(\t2020,\t3,\t6\t),\t-0.405385405\t],\n[Date.UTC(\t2020,\t3,\t7\t),\t-0.426906228\t],\n[Date.UTC(\t2020,\t3,\t8\t),\t-0.436154187\t],\n[Date.UTC(\t2020,\t3,\t9\t),\t-0.364930928\t],\n[Date.UTC(\t2020,\t3,\t10\t),\t-0.297665983\t],\n[Date.UTC(\t2020,\t3,\t11\t),\t-0.234553412\t],\n[Date.UTC(\t2020,\t3,\t12\t),\t-0.174035072\t],\n[Date.UTC(\t2020,\t3,\t13\t),\t-0.104888409\t],\n[Date.UTC(\t2020,\t3,\t14\t),\t-0.031383462\t],\n[Date.UTC(\t2020,\t3,\t15\t),\t0.015398301\t],\n[Date.UTC(\t2020,\t3,\t16\t),\t0.037974492\t],\n[Date.UTC(\t2020,\t3,\t17\t),\t0.02539487\t],\n[Date.UTC(\t2020,\t3,\t18\t),\t0.023320628\t],\n[Date.UTC(\t2020,\t3,\t19\t),\t0.019491961\t],\n[Date.UTC(\t2020,\t3,\t20\t),\t0.018112611\t],\n[Date.UTC(\t2020,\t3,\t21\t),\t0.017956024\t],\n[Date.UTC(\t2020,\t3,\t22\t),\t0.0112166\t],\n[Date.UTC(\t2020,\t3,\t23\t),\t0.010266093\t],\n[Date.UTC(\t2020,\t3,\t24\t),\t0.013967914\t],\n[Date.UTC(\t2020,\t3,\t25\t),\t0.022328582\t],\n[Date.UTC(\t2020,\t3,\t26\t),\t0.012902543\t],\n[Date.UTC(\t2020,\t3,\t27\t),\t0.009750078\t],\n[Date.UTC(\t2020,\t3,\t28\t),\t0.008145036\t],\n[Date.UTC(\t2020,\t3,\t29\t),\t-0.002274601\t],\n[Date.UTC(\t2020,\t3,\t30\t),\t-0.164729416\t],\n[Date.UTC(\t2020,\t4,\t1\t),\t-0.324322402\t],\n[Date.UTC(\t2020,\t4,\t2\t),\t-0.479435503\t],\n[Date.UTC(\t2020,\t4,\t3\t),\t-0.626868248\t],\n[Date.UTC(\t2020,\t4,\t4\t),\t-0.629779518\t],\n[Date.UTC(\t2020,\t4,\t5\t),\t-0.633800447\t],\n[Date.UTC(\t2020,\t4,\t6\t),\t-0.655948937\t],\n[Date.UTC(\t2020,\t4,\t7\t),\t-0.680199623\t],\n[Date.UTC(\t2020,\t4,\t8\t),\t-0.552216649\t],\n[Date.UTC(\t2020,\t4,\t9\t),\t-0.419512838\t],\n[Date.UTC(\t2020,\t4,\t10\t),\t-0.311450034\t],\n[Date.UTC(\t2020,\t4,\t11\t),\t-0.202179328\t],\n[Date.UTC(\t2020,\t4,\t12\t),\t-0.214021713\t],\n[Date.UTC(\t2020,\t4,\t13\t),\t-0.225912094\t],\n[Date.UTC(\t2020,\t4,\t14\t),\t-0.217582405\t],\n[Date.UTC(\t2020,\t4,\t15\t),\t-0.201112717\t],\n[Date.UTC(\t2020,\t4,\t16\t),\t-0.181888044\t],\n[Date.UTC(\t2020,\t4,\t17\t),\t-0.168543369\t],\n[Date.UTC(\t2020,\t4,\t18\t),\t-0.145152956\t],\n[Date.UTC(\t2020,\t4,\t19\t),\t-0.128315389\t],\n[Date.UTC(\t2020,\t4,\t20\t),\t-0.130478665\t],\n[Date.UTC(\t2020,\t4,\t21\t),\t-0.139866948\t],\n[Date.UTC(\t2020,\t4,\t22\t),\t-0.155551419\t],\n[Date.UTC(\t2020,\t4,\t23\t),\t-0.168068647\t],\n[Date.UTC(\t2020,\t4,\t24\t),\t-0.18199937\t],\n[Date.UTC(\t2020,\t4,\t25\t),\t-0.213087916\t],\n[Date.UTC(\t2020,\t4,\t26\t),\t-0.234597176\t],\n[Date.UTC(\t2020,\t4,\t27\t),\t-0.250920415\t],\n[Date.UTC(\t2020,\t4,\t28\t),\t-0.266539067\t],\n[Date.UTC(\t2020,\t4,\t29\t),\t-0.277551711\t],\n[Date.UTC(\t2020,\t4,\t30\t),\t-0.290439397\t],\n[Date.UTC(\t2020,\t4,\t31\t),\t-0.303432286\t],\n[Date.UTC(\t2020,\t5,\t1\t),\t-0.323361337\t],\n[Date.UTC(\t2020,\t5,\t2\t),\t-0.300462663\t],\n[Date.UTC(\t2020,\t5,\t3\t),\t-0.280450344\t],\n[Date.UTC(\t2020,\t5,\t4\t),\t-0.263287991\t],\n[Date.UTC(\t2020,\t5,\t5\t),\t-0.245527551\t],\n[Date.UTC(\t2020,\t5,\t6\t),\t-0.232887328\t],\n[Date.UTC(\t2020,\t5,\t7\t),\t-0.243464977\t],\n[Date.UTC(\t2020,\t5,\t8\t),\t-0.247292161\t],\n[Date.UTC(\t2020,\t5,\t9\t),\t-0.243059859\t],\n[Date.UTC(\t2020,\t5,\t10\t),\t-0.266873091\t],\n[Date.UTC(\t2020,\t5,\t11\t),\t-0.283071846\t],\n[Date.UTC(\t2020,\t5,\t12\t),\t-0.303538144\t],\n[Date.UTC(\t2020,\t5,\t13\t),\t-0.320301086\t],\n[Date.UTC(\t2020,\t5,\t14\t),\t-0.366788179\t],\n[Date.UTC(\t2020,\t5,\t15\t),\t-0.408184826\t],\n[Date.UTC(\t2020,\t5,\t16\t),\t-0.460775942\t],\n[Date.UTC(\t2020,\t5,\t17\t),\t-0.52346611\t],\n[Date.UTC(\t2020,\t5,\t18\t),\t-0.586077988\t],\n[Date.UTC(\t2020,\t5,\t19\t),\t-0.648359001\t],\n[Date.UTC(\t2020,\t5,\t20\t),\t-0.709529221\t],\n[Date.UTC(\t2020,\t5,\t21\t),\t-0.769200921\t],\n[Date.UTC(\t2020,\t5,\t22\t),\t-0.795313716\t],\n[Date.UTC(\t2020,\t5,\t23\t),\t-0.800327659\t],\n[Date.UTC(\t2020,\t5,\t24\t),\t-0.816995919\t],\n[Date.UTC(\t2020,\t5,\t25\t),\t-0.825593114\t],\n[Date.UTC(\t2020,\t5,\t26\t),\t-0.834684968\t],\n[Date.UTC(\t2020,\t5,\t27\t),\t-0.848111331\t],\n[Date.UTC(\t2020,\t5,\t28\t),\t-0.861526847\t],\n[Date.UTC(\t2020,\t5,\t29\t),\t-0.87921381\t],\n[Date.UTC(\t2020,\t5,\t30\t),\t-0.893565953\t],\n[Date.UTC(\t2020,\t6,\t1\t),\t-0.896668613\t],\n[Date.UTC(\t2020,\t6,\t2\t),\t-0.882887483\t],\n[Date.UTC(\t2020,\t6,\t3\t),\t-0.864051044\t],\n[Date.UTC(\t2020,\t6,\t4\t),\t-0.846198916\t],\n[Date.UTC(\t2020,\t6,\t5\t),\t-0.829522491\t],\n[Date.UTC(\t2020,\t6,\t6\t),\t-0.814812839\t],\n[Date.UTC(\t2020,\t6,\t7\t),\t-0.81246382\t],\n[Date.UTC(\t2020,\t6,\t8\t),\t-0.797657132\t],\n[Date.UTC(\t2020,\t6,\t9\t),\t-0.820079982\t],\n[Date.UTC(\t2020,\t6,\t10\t),\t-0.843645155\t],\n[Date.UTC(\t2020,\t6,\t11\t),\t-0.869549692\t],\n[Date.UTC(\t2020,\t6,\t12\t),\t-0.907154322\t],\n[Date.UTC(\t2020,\t6,\t13\t),\t-0.948628187\t],\n[Date.UTC(\t2020,\t6,\t14\t),\t-0.951313138\t],\n[Date.UTC(\t2020,\t6,\t15\t),\t-0.900282383\t],\n[Date.UTC(\t2020,\t6,\t16\t),\t-0.861160755\t],\n[Date.UTC(\t2020,\t6,\t17\t),\t-0.797471404\t],\n[Date.UTC(\t2020,\t6,\t18\t),\t-0.733634949\t],\n[Date.UTC(\t2020,\t6,\t19\t),\t-0.671113014\t],\n[Date.UTC(\t2020,\t6,\t20\t),\t-0.588680983\t],\n[Date.UTC(\t2020,\t6,\t21\t),\t-0.484726518\t],\n[Date.UTC(\t2020,\t6,\t22\t),\t-0.397025913\t],\n[Date.UTC(\t2020,\t6,\t23\t),\t-0.349787235\t],\n[Date.UTC(\t2020,\t6,\t24\t),\t-0.265588909\t],\n[Date.UTC(\t2020,\t6,\t25\t),\t-0.201905146\t],\n[Date.UTC(\t2020,\t6,\t26\t),\t-0.147291079\t],\n[Date.UTC(\t2020,\t6,\t27\t),\t-0.107686907\t],\n[Date.UTC(\t2020,\t6,\t28\t),\t-0.075230934\t],\n[Date.UTC(\t2020,\t6,\t29\t),\t-0.046366204\t],\n[Date.UTC(\t2020,\t6,\t30\t),\t-0.044824801\t],\n[Date.UTC(\t2020,\t6,\t31\t),\t-0.045302384\t],\n\n\n      ]\n    }, {\n      name: \"Indice des prix \u00e0 la consommation (IPC)\",\n      data: 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Date.UTC(\t2020,\t5,\t15\t),\t-0.310152769\t],\n[Date.UTC(\t2020,\t5,\t16\t),\t-0.310152769\t],\n[Date.UTC(\t2020,\t5,\t17\t),\t-0.310152769\t],\n[Date.UTC(\t2020,\t5,\t18\t),\t-0.310152769\t],\n[Date.UTC(\t2020,\t5,\t19\t),\t-0.310152769\t],\n[Date.UTC(\t2020,\t5,\t20\t),\t-0.310152769\t],\n[Date.UTC(\t2020,\t5,\t21\t),\t-0.310152769\t],\n[Date.UTC(\t2020,\t5,\t22\t),\t-0.310152769\t],\n[Date.UTC(\t2020,\t5,\t23\t),\t-0.310152769\t],\n[Date.UTC(\t2020,\t5,\t24\t),\t-0.310152769\t],\n[Date.UTC(\t2020,\t5,\t25\t),\t-0.310152769\t],\n[Date.UTC(\t2020,\t5,\t26\t),\t-0.310152769\t],\n[Date.UTC(\t2020,\t5,\t27\t),\t-0.310152769\t],\n[Date.UTC(\t2020,\t5,\t28\t),\t-0.310152769\t],\n[Date.UTC(\t2020,\t5,\t29\t),\t-0.310152769\t],\n[Date.UTC(\t2020,\t5,\t30\t),\t-0.310152769\t],\n[Date.UTC(\t2020,\t6,\t1\t),\t-0.476282835\t],\n[Date.UTC(\t2020,\t6,\t2\t),\t-0.476282835\t],\n[Date.UTC(\t2020,\t6,\t3\t),\t-0.476282835\t],\n[Date.UTC(\t2020,\t6,\t4\t),\t-0.476282835\t],\n[Date.UTC(\t2020,\t6,\t5\t),\t-0.476282835\t],\n[Date.UTC(\t2020,\t6,\t6\t),\t-0.476282835\t],\n[Date.UTC(\t2020,\t6,\t7\t),\t-0.476282835\t],\n[Date.UTC(\t2020,\t6,\t8\t),\t-0.476282835\t],\n[Date.UTC(\t2020,\t6,\t9\t),\t-0.476282835\t],\n[Date.UTC(\t2020,\t6,\t10\t),\t-0.476282835\t],\n[Date.UTC(\t2020,\t6,\t11\t),\t-0.476282835\t],\n[Date.UTC(\t2020,\t6,\t12\t),\t-0.476282835\t],\n[Date.UTC(\t2020,\t6,\t13\t),\t-0.476282835\t],\n[Date.UTC(\t2020,\t6,\t14\t),\t-0.476282835\t],\n[Date.UTC(\t2020,\t6,\t15\t),\t-0.476282835\t],\n[Date.UTC(\t2020,\t6,\t16\t),\t-0.476282835\t],\n[Date.UTC(\t2020,\t6,\t17\t),\t-0.476282835\t],\n[Date.UTC(\t2020,\t6,\t18\t),\t-0.476282835\t],\n[Date.UTC(\t2020,\t6,\t19\t),\t-0.476282835\t],\n[Date.UTC(\t2020,\t6,\t20\t),\t-0.476282835\t],\n[Date.UTC(\t2020,\t6,\t21\t),\t-0.476282835\t],\n[Date.UTC(\t2020,\t6,\t22\t),\t-0.476282835\t],\n[Date.UTC(\t2020,\t6,\t23\t),\t-0.476282835\t],\n[Date.UTC(\t2020,\t6,\t24\t),\t-0.476282835\t],\n[Date.UTC(\t2020,\t6,\t25\t),\t-0.476282835\t],\n[Date.UTC(\t2020,\t6,\t26\t),\t-0.476282835\t],\n[Date.UTC(\t2020,\t6,\t27\t),\t-0.476282835\t],\n[Date.UTC(\t2020,\t6,\t28\t),\t-0.476282835\t],\n[Date.UTC(\t2020,\t6,\t29\t),\t-0.476282835\t],\n[Date.UTC(\t2020,\t6,\t30\t),\t-0.476282835\t],\n[Date.UTC(\t2020,\t6,\t31\t),\t-0.476282835\t],\n\n      ]\n    },\n\n  ]\n});\n\n});\n\n\n\n<\/script>\n&#13;<br \/>\n&#13;<br \/>\n<span class=\"text__legend\">Remarque\u00a0: l\u2019indice calcul\u00e9 pour l\u2019\u00e9tude repose sur la variante de Fisher telle que d\u00e9crite dans l\u2019article. Les chiffres indiqu\u00e9s sont des moyennes sur sept jours. Les trois lignes verticales indiquent successivement la date du semi-confinement (16\u00a0mars) et les deux premiers assouplissements des mesures (27\u00a0avril et 11\u00a0mai). Les changements par rapport \u00e0 la semaine pr\u00e9c\u00e9dant le semi-confinement sont indiqu\u00e9s en pour-cent.<\/span>&#13;<br \/>\n&#13;<br \/>\n<span class=\"text__quelle--ground\">Source\u00a0: Lein et Alvarez (2020), OFS \/ La Vie \u00e9conomique<\/span>&#13;<br \/>\n&#13;<br \/>\nL\u2019\u00e9tude montre \u00e9galement que les trois variantes de l\u2019indice des prix (Laspeyres, Paasche et Fisher) ont diverg\u00e9 un peu plus que d\u2019habitude pendant le semi-confinement. Les prix ont chut\u00e9 d\u2019environ 0,5\u00a0% dans les premi\u00e8res semaines du semi-confinement, ce qui a modifi\u00e9 les habitudes d\u2019achat. Les d\u00e9penses pour les cat\u00e9gories de biens dont les prix sont plut\u00f4t en baisse ont par exemple sensiblement diminu\u00e9, tandis que celles destin\u00e9es aux produits alimentaires et aux boissons, dont les prix \u00e9taient l\u00e9g\u00e8rement en hausse, ont quelque peu augment\u00e9. Cette disparit\u00e9 n\u2019a toutefois \u00e9t\u00e9 que de courte dur\u00e9e\u00a0: les trois courbes de l\u2019indice retrouvaient d\u00e9j\u00e0 des \u00e9volutions similaires en mai.&#13;<br \/>\n&#13;<br \/>\nLes relev\u00e9s \u00e0 fr\u00e9quence rapproch\u00e9e sugg\u00e8rent que la baisse des niveaux de prix est imputable au semi-confinement. Contrairement aux chiffres de l\u2019\u00e9tude, cette baisse n\u2019est ressortie dans l\u2019IPC qu\u2019avec les donn\u00e9es d\u2019avril publi\u00e9es d\u00e9but mai, o\u00f9 elle n\u2019appara\u00eet pas extr\u00eamement importante par rapport aux mois pr\u00e9c\u00e9dents. Le recul des prix relativement sensible not\u00e9 entre mi-juin et d\u00e9but juillet est \u00e9galement moins prononc\u00e9 dans l\u2019IPC que dans l\u2019indice calcul\u00e9 pour l\u2019\u00e9tude, ce qui est probablement d\u00fb aux ventes saisonni\u00e8res dans la cat\u00e9gorie \u00ab\u00a0Habillement et chaussures\u00a0\u00bb, plus fr\u00e9quentes cette ann\u00e9e.&#13;<\/p>\n<h2>Des diff\u00e9rences sectorielles<\/h2>\n<p>&#13;<br \/>\nL\u2019\u00e9tude a finalement compar\u00e9 les mouvements de prix avec l\u2019\u00e9volution des d\u00e9penses relatives des consommateurs par carte de d\u00e9bit dans divers secteurs pendant la p\u00e9riode de semi-confinement (voir <em>illustration\u00a02<\/em>). Cette d\u00e9marche s\u2019est av\u00e9r\u00e9e instructive puisque, dans une optique statique comparative, les prix et les volumes d\u2019un secteur \u00e9voluent dans des directions diff\u00e9rentes lors des chocs d\u2019offre, alors qu\u2019ils suivent la m\u00eame orientation lors des chocs de demande.&#13;<br \/>\n&#13;<br \/>\nD\u00e8s le d\u00e9but du semi-confinement, il \u00e9tait clair que les mesures de lutte contre la pand\u00e9mie auraient une forte incidence directe sur certains secteurs comme la restauration et l\u2019h\u00f4tellerie, contraints de fermer temporairement. En revanche, d\u2019autres branches comme les transports n\u2019ont \u00e9t\u00e9 touch\u00e9es qu\u2019indirectement. Les mouvements de prix dans ces secteurs peuvent donc indiquer s\u2019ils sont plus susceptibles d\u2019\u00eatre affect\u00e9s par des chocs d\u2019offre ou des chocs de demande.&#13;<\/p>\n<h3 class=\"text__graphic-title\">Ill. 2. Variation des prix et des d\u00e9penses par cat\u00e9gories avant et apr\u00e8s le semi-confinement (en pour-cent)<\/h3>\n<p>&#13;<br \/>\n<a href=\"https:\/\/dievolkswirtschaft.ch\/content\/uploads\/2020\/08\/Bildschirmfoto-2020-09-16-um-11.52.00.png\"><img fetchpriority=\"high\" decoding=\"async\" class=\"alignnone size-full wp-image-98534\" src=\"https:\/\/dievolkswirtschaft.ch\/content\/uploads\/2020\/08\/Bildschirmfoto-2020-09-16-um-11.52.00.png\" alt=\"\" width=\"1964\" height=\"1054\" \/><\/a>&#13;<br \/>\n&#13;<br \/>\n<span class=\"text__legend\">Remarque\u00a0: le graphique fait une comparaison entre la semaine pr\u00e9c\u00e9dant le semi-confinement (du 9\u00a0au 15\u00a0mars) et la p\u00e9riode de semi-confinement (du 16\u00a0mars au 11\u00a0mai).<\/span>&#13;<br \/>\n&#13;<br \/>\n<span class=\"text__quelle--ground\">Source\u00a0: Alvarez et Lein (2020), Monitoring Consumption Switzerland \/ La Vie \u00e9conomique<\/span>&#13;<br \/>\n&#13;<br \/>\nLes prix dans le secteur du commerce de d\u00e9tail (hors alimentation, boissons et tabac) ont ainsi sensiblement baiss\u00e9 entre la semaine pr\u00e9c\u00e9dant le semi-confinement (du 9\u00a0au 15\u00a0mars) et la phase de semi-confinement (du 16\u00a0mars au 11\u00a0mai), tandis que les d\u00e9penses diminuaient \u00e9galement de moiti\u00e9 environ. Une \u00e9volution similaire a \u00e9t\u00e9 observ\u00e9e dans les transports, quoique moins prononc\u00e9e. Ces mouvements \u2013\u00a0chute des prix et baisse encore plus marqu\u00e9e des d\u00e9penses\u00a0\u2013 sont typiquement li\u00e9s \u00e0 un choc n\u00e9gatif sur la demande.&#13;<br \/>\n&#13;<br \/>\nLa baisse des d\u00e9penses la plus spectaculaire a eu lieu dans les secteurs \u00ab\u00a0Restaurants et h\u00f4tels\u00a0\u00bb et \u00ab\u00a0Loisirs et culture\u00a0\u00bb. Les prix ont l\u00e0 aussi baiss\u00e9 en parall\u00e8le, mais moins fortement que dans les secteurs mentionn\u00e9s pr\u00e9c\u00e9demment. Enfin, au chapitre des services, les d\u00e9penses ont diminu\u00e9, mais les prix sont rest\u00e9s pratiquement inchang\u00e9s, ce qui semble indiquer que les chocs de l\u2019offre et de la demande sont \u00e0 peu pr\u00e8s \u00e0 l\u2019\u00e9quilibre. Dans le secteur \u00ab\u00a0Alimentation, boissons et tabac\u00a0\u00bb, moins touch\u00e9 par le semi-confinement, les d\u00e9penses ont m\u00eame augment\u00e9 alors que les prix sont rest\u00e9s stables, signe d\u2019une expansion \u00e0 peu pr\u00e8s \u00e9quivalente de l\u2019offre et de la demande.&#13;<\/p>\n<h2>Un choc de la demande un peu plus prononc\u00e9<\/h2>\n<p>&#13;<br \/>\nEn r\u00e9sum\u00e9, on peut affirmer qu\u2019il y a eu un choc de l\u2019offre et un choc de la demande au d\u00e9but du semi-confinement. Tous deux ont provoqu\u00e9 un recul de l\u2019activit\u00e9 \u00e9conomique r\u00e9elle. La l\u00e9g\u00e8re baisse de l\u2019indice des prix calcul\u00e9 dans l\u2019\u00e9tude en d\u00e9but de semi-confinement sugg\u00e8re un choc de la demande un peu plus important, mais cela peut \u00e0 nouveau changer rapidement compte tenu de la volatilit\u00e9 des conditions.&#13;<br \/>\n&#13;<br \/>\nIl est \u00e9galement possible que les effets de la crise et les changements correspondants de l\u2019offre et de la demande (relative) ne se traduisent clairement dans les prix qu\u2019\u00e0 un stade ult\u00e9rieur. Voil\u00e0 pourquoi un indice des prix sur une base journali\u00e8re, utilis\u00e9 comme indicateur avanc\u00e9, est un instrument judicieux en p\u00e9riode de turbulences, par exemple lorsque le manque d\u2019informations rend plus difficile d\u2019enqu\u00eater sur les prix par le biais des statistiques officielles. Il est \u00e9galement possible que les prix en ligne, tendanciellement plus flexibles que ceux en magasin, indiquent d\u2019\u00e9ventuelles tendances d\u00e9flationnistes ou inflationnistes de mani\u00e8re plus pr\u00e9coce. Les auteurs de l\u2019\u00e9tude continueront de surveiller leur indice et de le mettre \u00e0 jour r\u00e9guli\u00e8rement (ou sur demande).<\/p>\n<ol class=\"footnote\"><li id=\"footnote_1\" class=\"footnote--item\">Cet article est paru le 14\u00a0juillet\u00a02020 sous une forme l\u00e9g\u00e8rement r\u00e9duite sur le <a href=\"https:\/\/unibaswwzfaculty.blog\/2020\/07\/14\/inflation-oder-deflation\/\">WWZ Faculty Blog<\/a>, le blog \u00e9conomique de l\u2019universit\u00e9 de B\u00e2le.&nbsp;<a href=\"#footnote-anchor_1\" class=\"inline-footnote__anchor hidden-print\">[<span class=\"icon-arrow-up\"><\/span>]<\/a><\/li><li id=\"footnote_2\" class=\"footnote--item\">OFS (2020).&nbsp;<a href=\"#footnote-anchor_2\" class=\"inline-footnote__anchor hidden-print\">[<span class=\"icon-arrow-up\"><\/span>]<\/a><\/li><li id=\"footnote_3\" class=\"footnote--item\">Alvarez et Lein (2020).&nbsp;<a href=\"#footnote-anchor_3\" class=\"inline-footnote__anchor hidden-print\">[<span class=\"icon-arrow-up\"><\/span>]<\/a><\/li><li id=\"footnote_4\" class=\"footnote--item\">Voir Kr\u00e4nzlin, Meyer et Nellen (2020).&nbsp;<a href=\"#footnote-anchor_4\" class=\"inline-footnote__anchor hidden-print\">[<span class=\"icon-arrow-up\"><\/span>]<\/a><\/li><\/ol>","protected":false},"excerpt":{"rendered":"<p>La pand\u00e9mie de Covid-19 a provoqu\u00e9 une r\u00e9cession mondiale. Il s\u2019agit d\u00e9sormais de d\u00e9terminer l\u2019ampleur et la pr\u00e9valence respectives des chocs d\u2019offre et de demande. Les responsables de la politique \u00e9conomique ont en effet besoin de savoir si la r\u00e9cession est due \u00e0 une faiblesse de la demande ou \u00e0 une restriction de l\u2019offre. Comme [&hellip;]<\/p>","protected":false},"author":5076,"featured_media":101090,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"om_disable_all_campaigns":false,"ep_exclude_from_search":false,"footnotes":""},"post__type":[83],"post_opinion":[],"post_serie":[],"post_content_category":[105],"post_content_subject":[],"acf":{"seco_author":5076,"seco_co_author":[5077,0],"author_override":"","seco_author_post_ocupation_year":"","seco_author_post_occupation_de":"Professorin f\u00fcr Makro\u00f6konomie, Universit\u00e4t Basel","seco_author_post_occupation_fr":"Professeure de macro\u00e9conomie, universit\u00e9 de B\u00e2le","seco_co_authors_post_ocupation":[{"seco_co_author":5077,"seco_co_author_post_occupation_year":"","seco_co_author_post_occupation_de":"Doktorand im Bereich Makro\u00f6konomie, Universit\u00e4t Basel","seco_co_author_post_occupation_fr":"Doctorant en macro\u00e9conomie, universit\u00e9 de B\u00e2le"}],"short_title":"Un indice des prix en temps r\u00e9el","post_lead":"L\u2019indice des prix \u00e0 la consommation refl\u00e8te normalement de mani\u00e8re fiable l\u2019\u00e9volution de l\u2019inflation en Suisse. Une partie de la base de donn\u00e9es a cependant disparu soudainement lors du semi-confinement impos\u00e9 par la Covid-19. Un nouvel indice de l\u2019universit\u00e9 de B\u00e2le reposant davantage sur des donn\u00e9es en ligne offre une solution.","post_hero_image_description":"Les collections de printemps n\u2019ont pas pu \u00eatre vendues lors du semi-confinement. Un centre commercial \u00e0 Stans.","post_hero_image_description_copyright_de":"Keystone","post_hero_image_description_copyright_fr":"Keystone","post_references_literature":"<ul>&#13;\n \t<li>Alvarez S. E. et Lein S. M. (2020). \u00ab\u00a0<a href=\"https:\/\/www.google.com\/url?sa=t&amp;rct=j&amp;q=&amp;esrc=s&amp;source=web&amp;cd=&amp;ved=2ahUKEwjJysy3lbnrAhXr-ioKHa_gAXEQFjAAegQIBRAB&amp;url=http%3A%2F%2Fwww.sarah-lein.ch%2FDailyInflation.pdf&amp;usg=AOvVaw0J72RJbLPhUMUh2YXK0Zvf\">Tracking Inflation on a Daily Basis<\/a>\u00bb. <em>CEPR Covid Economics<\/em>, N\u00b0\u00a042.<\/li>&#13;\n \t<li>OFS \u2013\u00a0Office f\u00e9d\u00e9ral de la statistique (2020). <a href=\"https:\/\/www.bfs.admin.ch\/news\/fr\/2020-0403\"><em>Les prix \u00e0 la consommation ont baiss\u00e9 de 0,4\u00a0% en avril\u00a02020<\/em><\/a>. Communiqu\u00e9 de presse du 5\u00a0mai.<\/li>&#13;\n \t<li>Kraenzlin S., Meyer C. et Nellen T. (2020). \u00ab\u00a0<a href=\"https:\/\/www.snb.ch\/n\/mmr\/reference\/working_paper_2020_15\/source\/working_paper_2020_15.n.pdf\">Covid-19 and regional shifts in Swiss retail payments<\/a>\u00bb. <em>SNB Working Papers<\/em>, 16\/2020, Banque nationale suisse.<\/li>&#13;\n<\/ul>","post_kasten":null,"post_notes_for_print":"","first_teaser_header_de":"","first_teaser_header_fr":"","first_teaser_text_de":"","first_teaser_text_fr":"","second_teaser_header_de":"","second_teaser_header_fr":"","second_teaser_text_de":"","second_teaser_text_fr":"","kseason_de":"","kseason_fr":"","post_in_pdf":131749,"main_focus":null,"serie_email":null,"frontpage_slider_bild":131753,"artikel_bild-slider":null,"legacy_id":"97567","post_abstract":"Les mouvements de prix peuvent \u00eatre un indicateur significatif de l\u2019ampleur relative des chocs de l\u2019offre et de la demande. Or, c\u2019est pr\u00e9cis\u00e9ment au d\u00e9but de la crise du coronavirus en Suisse, lorsqu\u2019il a fallu prendre des d\u00e9cisions sur des plans de relance \u00e9conomique, qu\u2019il est devenu tr\u00e8s difficile de mesurer les prix dans certains secteurs, car ils n\u2019\u00e9taient plus observables comme \u00e0 l\u2019ordinaire. Parall\u00e8lement, de nombreux consommateurs effectuaient leurs achats en ligne plut\u00f4t qu\u2019en magasin. Un indice des prix a donc \u00e9t\u00e9 calcul\u00e9 \u00e0 partir de plus de 75\u00a0000\u00a0produits propos\u00e9s chaque jour sur Internet, pond\u00e9r\u00e9s selon les d\u00e9penses par carte de d\u00e9bit, \u00e9galement mises \u00e0 jour quotidiennement. Cet indice ne r\u00e9v\u00e8le actuellement aucune tendance inflationniste ou d\u00e9flationniste nette sur une base agr\u00e9g\u00e9e. On observe toutefois des diff\u00e9rences selon les secteurs\u00a0: si les prix enregistrent une l\u00e9g\u00e8re hausse dans l\u2019industrie alimentaire, ils continuent de baisser mod\u00e9r\u00e9ment ailleurs.","magazine_issue":"20201001","seco_author_reccomended_post":null,"redaktoren":[4127,0],"korrektor":4139,"planned_publication_date":"20200922","original_files":null,"external_release_for_author":"20200906","external_release_for_author_time":"23:30:00","link_for_external_authors":"https:\/\/dievolkswirtschaft.ch\/exedit\/5f32764a9491a"},"_links":{"self":[{"href":"https:\/\/dievolkswirtschaft.ch\/fr\/wp-json\/wp\/v2\/posts\/131746"}],"collection":[{"href":"https:\/\/dievolkswirtschaft.ch\/fr\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/dievolkswirtschaft.ch\/fr\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/dievolkswirtschaft.ch\/fr\/wp-json\/wp\/v2\/users\/5076"}],"replies":[{"embeddable":true,"href":"https:\/\/dievolkswirtschaft.ch\/fr\/wp-json\/wp\/v2\/comments?post=131746"}],"version-history":[{"count":1,"href":"https:\/\/dievolkswirtschaft.ch\/fr\/wp-json\/wp\/v2\/posts\/131746\/revisions"}],"predecessor-version":[{"id":187588,"href":"https:\/\/dievolkswirtschaft.ch\/fr\/wp-json\/wp\/v2\/posts\/131746\/revisions\/187588"}],"acf:user":[{"embeddable":true,"href":"https:\/\/dievolkswirtschaft.ch\/fr\/wp-json\/wp\/v2\/users\/4139"},{"embeddable":true,"href":"https:\/\/dievolkswirtschaft.ch\/fr\/wp-json\/wp\/v2\/users\/4127"},{"embeddable":true,"href":"https:\/\/dievolkswirtschaft.ch\/fr\/wp-json\/wp\/v2\/users\/0"},{"embeddable":true,"href":"https:\/\/dievolkswirtschaft.ch\/fr\/wp-json\/wp\/v2\/users\/5077"},{"embeddable":true,"href":"https:\/\/dievolkswirtschaft.ch\/fr\/wp-json\/wp\/v2\/users\/5076"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/dievolkswirtschaft.ch\/fr\/wp-json\/wp\/v2\/media\/101090"}],"wp:attachment":[{"href":"https:\/\/dievolkswirtschaft.ch\/fr\/wp-json\/wp\/v2\/media?parent=131746"}],"wp:term":[{"taxonomy":"post__type","embeddable":true,"href":"https:\/\/dievolkswirtschaft.ch\/fr\/wp-json\/wp\/v2\/post__type?post=131746"},{"taxonomy":"post_opinion","embeddable":true,"href":"https:\/\/dievolkswirtschaft.ch\/fr\/wp-json\/wp\/v2\/post_opinion?post=131746"},{"taxonomy":"post_serie","embeddable":true,"href":"https:\/\/dievolkswirtschaft.ch\/fr\/wp-json\/wp\/v2\/post_serie?post=131746"},{"taxonomy":"post_content_category","embeddable":true,"href":"https:\/\/dievolkswirtschaft.ch\/fr\/wp-json\/wp\/v2\/post_content_category?post=131746"},{"taxonomy":"post_content_subject","embeddable":true,"href":"https:\/\/dievolkswirtschaft.ch\/fr\/wp-json\/wp\/v2\/post_content_subject?post=131746"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}