{"id":1365,"date":"2026-01-08T09:15:50","date_gmt":"2026-01-08T08:15:50","guid":{"rendered":"https:\/\/www.2em.ch\/blog\/?p=1365"},"modified":"2026-01-08T09:17:53","modified_gmt":"2026-01-08T08:17:53","slug":"loi-de-pareto","status":"publish","type":"post","link":"https:\/\/www.2em.ch\/blog\/loi-de-pareto\/","title":{"rendered":"80 % des locations viennent de 20 % des voitures &#8211; ce que la loi de Pareto nous a appris sur le car sharing"},"content":{"rendered":"<h2><b>Introduction \u2014 Pareto n\u2019avait pas parl\u00e9 de voitures, mais presque<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">En \u00e9conomie, on parle souvent de la <\/span><b>loi de Pareto<\/b><span style=\"font-weight: 400;\">, aussi appel\u00e9e la r\u00e8gle du <\/span><b>80 \/ 20<\/b><span style=\"font-weight: 400;\"> : 80 % des effets proviennent de 20 % des causes.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">On la retrouve partout :<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">80 % du chiffre d\u2019affaires vient de 20 % des clients<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">80 % des bugs viennent de 20 % du code<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">80 % des r\u00e9sultats viennent de 20 % des efforts<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">Quand nous avons commenc\u00e9 \u00e0 analyser en d\u00e9tail les donn\u00e9es de 2EM car sharing, nous ne cherchions pas \u00e0 v\u00e9rifier cette loi.<\/span><span style=\"font-weight: 400;\"><br \/>\n<\/span><span style=\"font-weight: 400;\">Mais elle s\u2019est impos\u00e9e \u00e0 nous, de fa\u00e7on presque brutale.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">\ud83d\udc49 <\/span><b>Environ 80 % des locations r\u00e9alis\u00e9es sur la plateforme proviennent de moins de 20 % des voitures.<\/b><\/p>\n<p><span style=\"font-weight: 400;\">Et non, ce n\u2019est ni un hasard, ni une fatalit\u00e9.<\/span><\/p>\n<p>&nbsp;<\/p>\n<h2><b>Ce que disent vraiment les chiffres<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">\u00c0 premi\u00e8re vue, on pourrait croire que :<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">certaines voitures sont plus r\u00e9centes<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">mieux \u00e9quip\u00e9es<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">ou simplement moins ch\u00e8res<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">Mais en creusant les donn\u00e9es, ce n\u2019est <\/span><b>pas \u00e7a<\/b><span style=\"font-weight: 400;\"> qui fait la diff\u00e9rence principale.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Des voitures tr\u00e8s similaires (mod\u00e8le, prix, localisation) peuvent avoir :<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">soit un excellent taux de r\u00e9servation<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">soit quasiment aucune demande accept\u00e9e<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">La variable cl\u00e9 n\u2019est pas la voiture.<\/span><\/p>\n<p><span style=\"font-weight: 400;\"><br \/>\n<\/span><span style=\"font-weight: 400;\"> \ud83d\udc49 <\/span><b>C\u2019est le comportement du propri\u00e9taire.<\/b><\/p>\n<p>&nbsp;<\/p>\n<h2><b>Le vrai facteur diff\u00e9renciant : l\u2019acceptation<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">Les voitures qui g\u00e9n\u00e8rent le plus de locations ont presque toujours les m\u00eames caract\u00e9ristiques :<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">\u2705 <\/span><b>leur propri\u00e9taire accepte une majorit\u00e9 des demandes<\/b><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">\ud83d\uddd3\ufe0f <\/span><b>leurs disponibilit\u00e9s sont tenues \u00e0 jour<\/b><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">\ud83d\udd01 <\/span><b>elles sont lou\u00e9es r\u00e9guli\u00e8rement<\/b><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">\u00c0 l\u2019inverse, une grande partie des annonces visibles sur une plateforme de car sharing :<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">refusent souvent<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">r\u00e9pondent tardivement<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">ou ne sont disponibles que \u201cth\u00e9oriquement\u201d<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">R\u00e9sultat :<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">frustration c\u00f4t\u00e9 locataires<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">perte de confiance<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">baisse globale des conversions<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">Sur une plateforme de partage, <\/span><b>un \u201cnon\u201d r\u00e9p\u00e9t\u00e9 a un co\u00fbt syst\u00e9mique<\/b><span style=\"font-weight: 400;\">.<\/span><\/p>\n<p>&nbsp;<\/p>\n<h2><b>Pourquoi plus de voitures ne veut pas forc\u00e9ment dire plus de locations<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">C\u2019est contre-intuitif, mais essentiel \u00e0 comprendre.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Ajouter des annonces mais refuser la majorit\u00e9 des demandes :<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">donne une illusion de choix<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">d\u00e9grade l\u2019exp\u00e9rience utilisateur<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">fait baisser le taux de r\u00e9servation global<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">Autrement dit :<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Une plateforme avec moins de voitures, mais plus fiables,<\/span><span style=\"font-weight: 400;\"><br \/>\n<\/span><span style=\"font-weight: 400;\"> fonctionne mieux qu\u2019une plateforme avec beaucoup d\u2019annonces fant\u00f4mes.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">C\u2019est une r\u00e9alit\u00e9 que peu de plateformes aiment afficher, parce qu\u2019elle va \u00e0 l\u2019encontre de la logique du volume \u00e0 tout prix.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Chez 2EM, nous d\u00e9sactivons syst\u00e9matiquement depuis quelques mois les annonces de v\u00e9hicules dont les demandes ont \u00e9t\u00e9 refus\u00e9es ou annul\u00e9es 3 fois cons\u00e9cutivement. Car nous privil\u00e9gions la qualit\u00e9 \u00e0 la quantit\u00e9.<\/span><\/p>\n<p>&nbsp;<\/p>\n<h2><b>Faire partie des \u201c20 %\u201d : les bonnes pratiques<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">La bonne nouvelle, c\u2019est que <\/span><b>faire partie des 20 % n\u2019est pas r\u00e9serv\u00e9 \u00e0 une \u00e9lite<\/b><span style=\"font-weight: 400;\">.<\/span><span style=\"font-weight: 400;\"><br \/>\n<\/span><span style=\"font-weight: 400;\"> Ce n\u2019est ni une question de mod\u00e8le de voiture, ni de budget.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Voici ce qui fait concr\u00e8tement la diff\u00e9rence.<\/span><\/p>\n<h3><b>1\ufe0f\u20e3 R\u00e9pondre vite (m\u00eame pour dire non)<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">Un locataire qui attend une r\u00e9ponse :<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">compare plusieurs options<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">prend la premi\u00e8re r\u00e9ponse fiable<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">M\u00eame un refus rapide est pr\u00e9f\u00e9rable \u00e0 un silence prolong\u00e9. La r\u00e9activit\u00e9 est un signal de s\u00e9rieux.<\/span><\/p>\n<h3><b>2\ufe0f\u20e3 Accepter quand la demande est coh\u00e9rente<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">Les propri\u00e9taires les plus performants ne disent pas \u201coui \u00e0 tout\u201d. Ils disent <\/span><b>oui quand la demande respecte les r\u00e8gles<\/b><span style=\"font-weight: 400;\">.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Refuser syst\u00e9matiquement \u201cpar principe\u201d revient \u00e0 sortir du jeu du partage.<\/span><\/p>\n<h3><b>3\ufe0f\u20e3 Maintenir un calendrier r\u00e9aliste<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">Une voiture affich\u00e9e comme disponible mais dont la r\u00e9servation est finalement refus\u00e9e :<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">g\u00e9n\u00e8re des demandes inutiles<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">fait perdre du temps \u00e0 tout le monde<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">p\u00e9nalise l\u2019annonce sur le long terme<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">Un calendrier pr\u00e9cis = moins de frictions = plus de locations.<\/span><\/p>\n<h3><b>4\ufe0f\u20e3 Soigner son annonce (sans la sur-vendre)<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">Les annonces qui fonctionnent :<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">sont claires<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">honn\u00eates<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">compl\u00e8tes<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">Photos nettes, description simple, r\u00e8gles explicites. Pas besoin d\u2019en faire trop \u2014 il faut surtout \u00e9viter les zones floues.<\/span><\/p>\n<h3><b>5\ufe0f\u20e3 Jouer le jeu du partage<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">Le car sharing n\u2019est pas un revenu passif. C\u2019est une <\/span><b>mise \u00e0 disposition intelligente d\u2019un bien sous-utilis\u00e9<\/b><span style=\"font-weight: 400;\">.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Les propri\u00e9taires qui l\u2019acceptent d\u00e8s le d\u00e9part :<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">ont moins de frustrations<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">re\u00e7oivent plus de demandes pertinentes<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">louent plus souvent<\/span><\/li>\n<\/ul>\n<h2><b>Conclusion \u2014 Pareto n\u2019est pas une fatalit\u00e9<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">La loi de Pareto n\u2019est pas une excuse pour dire :<\/span><\/p>\n<p><span style=\"font-weight: 400;\">\u201cSeuls 20 % y arrivent.\u201d<\/span><\/p>\n<p><span style=\"font-weight: 400;\">C\u2019est un <\/span><b>outil de lecture<\/b><span style=\"font-weight: 400;\">.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Chez 2EM, elle nous a surtout appris une chose :<\/span><\/p>\n<p>&nbsp;<\/p>\n<p><span style=\"font-weight: 400;\">\ud83d\udc49 la performance d\u2019une plateforme de partage d\u00e9pend beaucoup plus des comportements que de la technologie.<\/span><\/p>\n<p>&nbsp;<\/p>\n<p><span style=\"font-weight: 400;\">Et la bonne nouvelle, c\u2019est que chacun peut d\u00e9cider de faire partie des 20 %.<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Introduction \u2014 Pareto n\u2019avait pas parl\u00e9 de voitures, mais presque En \u00e9conomie, on parle souvent de la loi de Pareto, aussi appel\u00e9e la r\u00e8gle du 80 \/ 20 : 80&#8230;<\/p>\n","protected":false},"author":14,"featured_media":1366,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"gallery","meta":[],"categories":[2],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v19.9 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Le principe de Pareto appliqu\u00e9 \u00e0 notre activit\u00e9 | 2EM car sharing<\/title>\n<meta name=\"description\" content=\"Environ 80 % des locations r\u00e9alis\u00e9es sur la plateforme proviennent de moins de 20 % des voitures. 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