{"id":3968,"date":"2026-03-21T11:10:52","date_gmt":"2026-03-21T10:10:52","guid":{"rendered":"https:\/\/faugeron.net\/?p=3968"},"modified":"2026-03-22T09:31:24","modified_gmt":"2026-03-22T08:31:24","slug":"cest-vraiment-moi-qui-decide","status":"publish","type":"post","link":"https:\/\/faugeron.net\/?p=3968","title":{"rendered":"C&rsquo;est (vraiment ?) moi qui d\u00e9cide"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\"><em>Auteur : Dan Ariely<\/em><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">J&rsquo;aime bien l&rsquo;\u00e9conomie comportementale, parce que je suis assez convaincu  \u00e0 la fois de notre irrationalit\u00e9, et aussi de son c\u00f4t\u00e9 pr\u00e9visible. Ceci dit, mon avis personnel n&rsquo;a pas grand int\u00e9r\u00eat, surtout qu&rsquo;il est probablement nourri de mes cours d&rsquo;\u00e9co qui pr\u00e9tendaient tout rationnaliser dans des \u00e9quitations et des courbes.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Ce petit ouvrage de moins de 300 pages en poche conforte mon avis et m\u00eame si c&rsquo;est un parfait exemple de biais de confirmation, cela fait plaisir. Ce qui est principe m\u00eame de ces biais \ud83e\udee8<\/p>\n\n\n\n<!--more-->\n\n\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/fr.wikipedia.org\/wiki\/Dan_Ariely\" target=\"_blank\" rel=\"noreferrer noopener\">Ariely <\/a>est professeur en psychologie et \u00e9conomie comportementale \u00e0 l&rsquo;universit\u00e9 Duke. Cet ouvrage partage les r\u00e9sultats de plusieurs de ses exp\u00e9riences et recherches sur la pr\u00e9dictibilit\u00e9 de l&rsquo;irrationalit\u00e9 humaine (Le titre anglais est <em>Predictably irrational : the hidden forces<\/em>).<\/p>\n\n\n\n<div class=\"wp-block-group is-nowrap is-layout-flex wp-container-core-group-is-layout-3a88641f wp-block-group-is-layout-flex\">\n<p class=\"wp-block-paragraph\">Ainsi on rappelle que nous observons toujours les choses qui nous entourent en relation avec d&rsquo;autres choses, c&rsquo;est la fameuse <a href=\"https:\/\/fr.wikipedia.org\/wiki\/Illusion_d%27Ebbinghaus\">illusion d&rsquo;Ebbinghaus<\/a>, qui s&rsquo;applique dans bien d&rsquo;autres domaines que l&rsquo;illusion d&rsquo;optique ; c&rsquo;est par exemple ce qui explique l&rsquo;utilisation des leurres dans la pr\u00e9sentation du prix des offres par exemples.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" src=\"data:image\/png;base64,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\" alt=\"\"\/><\/figure>\n<\/div>\n\n\n\n<p class=\"wp-block-paragraph\">Beaucoup de ces biais comportementaux sont utilis\u00e9s dans des sites d&rsquo;achat : ainsi le \u00ab\u00a0<em>herding<\/em>\u00a0\u00bb o\u00f9 l&rsquo;on nous annonce que 45 personnes sont en train de regarder le m\u00eame article que nous ; le biais de premier d\u00e9cision qui postule que nous sommes fortement influenc\u00e9 par nos premi\u00e8res d\u00e9cisions, ainsi on compare une information par rapport \u00e0 la premi\u00e8re fois o\u00f9 elle nous a \u00e9t\u00e9 soumise (d&rsquo;o\u00f9 l&rsquo;importance du prix barr\u00e9, de l&rsquo;ancre du premier prix dans une n\u00e9go).<br>Sommes nous intrins\u00e8quement honn\u00eates ou malhonn\u00eates ? Une \u00e9tude montre qu&rsquo;il suffit de rappeler la notion d&rsquo;honn\u00eatet\u00e9 (rappel d&rsquo;une r\u00e8gle par exemple) pour que subitement on s&rsquo;abstienne de tricher.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Ce qui est int\u00e9ressant avec cette approche de la <em>behavioral economics<\/em> est qu&rsquo;elle nous permet de comprendre ces biais, de savoir qu&rsquo;ils sont en nous et donc cela laisse une fen\u00eatre pour tenter de corriger le tir. Le plus simple \u00e9tant en g\u00e9n\u00e9ral de ne pas c\u00e9der \u00e0 nos impulsions qui par d\u00e9finition ne nous laissent pas le temps de l&rsquo;analyse.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">L&rsquo;autre enseignement est de fuir les sites de ventes en ligne qui abusent de ces ressorts (herding, FOMO &#8211; plus que 3 si\u00e8ges disponibles \u00e0 ce prix \ud83d\udeeb &#8211; premi\u00e8re d\u00e9cision&#8230; \ud83d\udc4b\ud83c\udffc EasyJet !).<\/p>\n\n\n\n<div class=\"wp-block-jetpack-slideshow aligncenter\" data-effect=\"slide\" style=\"--aspect-ratio:calc(150 \/ 220)\"><div class=\"wp-block-jetpack-slideshow_container swiper\"><ul class=\"wp-block-jetpack-slideshow_swiper-wrapper swiper-wrapper\"><li class=\"wp-block-jetpack-slideshow_slide swiper-slide\"><figure><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"220\" alt=\"\" class=\"wp-block-jetpack-slideshow_image wp-image-3976\" data-id=\"3976\" data-aspect-ratio=\"150 \/ 220\" src=\"https:\/\/i0.wp.com\/faugeron.net\/wp-content\/uploads\/2018\/10\/Comment-reussir-une-negociation.jpg?resize=150%2C220&#038;ssl=1\"\/><\/figure><\/li><li class=\"wp-block-jetpack-slideshow_slide swiper-slide\"><figure><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"232\" alt=\"\" class=\"wp-block-jetpack-slideshow_image wp-image-3971\" data-id=\"3971\" data-aspect-ratio=\"150 \/ 232\" src=\"https:\/\/i0.wp.com\/faugeron.net\/wp-content\/uploads\/2018\/08\/Influence-et-manipulation.jpg?resize=150%2C232&#038;ssl=1\"\/><\/figure><\/li><\/ul><a class=\"wp-block-jetpack-slideshow_button-prev swiper-button-prev swiper-button-white\" role=\"button\"><\/a><a class=\"wp-block-jetpack-slideshow_button-next swiper-button-next swiper-button-white\" role=\"button\"><\/a><a aria-label=\"Pause Slideshow\" class=\"wp-block-jetpack-slideshow_button-pause\" role=\"button\"><\/a><div class=\"wp-block-jetpack-slideshow_pagination swiper-pagination swiper-pagination-white\"><\/div><\/div><\/div>\n\n\n<div class=\"wp-block-jetpack-rating-star\" style=\"text-align:left\" itemprop=\"reviewRating\" itemscope itemtype=\"http:\/\/schema.org\/Rating\"><p><span aria-hidden=\"true\">\u2b50<\/span><span aria-hidden=\"true\">\u2b50<\/span><span aria-hidden=\"true\">\u2b50<\/span><span aria-hidden=\"true\">\u2b50<\/span><\/p><span style=\"display: none;\" itemprop=\"worstRating\" content=\"0.5\"><span>\n<svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"24\" height=\"24\" viewBox=\"0 0 24 24\">\n\t<path class=\"\" fill=\"currentColor\" stroke=\"currentColor\" d=\"M12,17.3l6.2,3.7l-1.6-7L22,9.2l-7.2-0.6L12,2L9.2,8.6L2,9.2L7.5,14l-1.6,7L12,17.3z\" \/>\n<\/svg>\n<\/span>\n<span>\n<svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"24\" height=\"24\" viewBox=\"0 0 24 24\">\n\t<path class=\"\" fill=\"currentColor\" stroke=\"currentColor\" d=\"M12,17.3l6.2,3.7l-1.6-7L22,9.2l-7.2-0.6L12,2L9.2,8.6L2,9.2L7.5,14l-1.6,7L12,17.3z\" \/>\n<\/svg>\n<\/span><\/span><span style=\"display: none;\" ><span>\n<svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"24\" height=\"24\" viewBox=\"0 0 24 24\">\n\t<path class=\"\" fill=\"currentColor\" stroke=\"currentColor\" d=\"M12,17.3l6.2,3.7l-1.6-7L22,9.2l-7.2-0.6L12,2L9.2,8.6L2,9.2L7.5,14l-1.6,7L12,17.3z\" \/>\n<\/svg>\n<\/span>\n<span>\n<svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"24\" height=\"24\" viewBox=\"0 0 24 24\">\n\t<path class=\"\" fill=\"currentColor\" stroke=\"currentColor\" d=\"M12,17.3l6.2,3.7l-1.6-7L22,9.2l-7.2-0.6L12,2L9.2,8.6L2,9.2L7.5,14l-1.6,7L12,17.3z\" \/>\n<\/svg>\n<\/span><\/span><span style=\"display: none;\" ><span>\n<svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"24\" height=\"24\" viewBox=\"0 0 24 24\">\n\t<path class=\"\" fill=\"currentColor\" stroke=\"currentColor\" d=\"M12,17.3l6.2,3.7l-1.6-7L22,9.2l-7.2-0.6L12,2L9.2,8.6L2,9.2L7.5,14l-1.6,7L12,17.3z\" \/>\n<\/svg>\n<\/span>\n<span>\n<svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"24\" height=\"24\" viewBox=\"0 0 24 24\">\n\t<path class=\"\" fill=\"currentColor\" stroke=\"currentColor\" d=\"M12,17.3l6.2,3.7l-1.6-7L22,9.2l-7.2-0.6L12,2L9.2,8.6L2,9.2L7.5,14l-1.6,7L12,17.3z\" \/>\n<\/svg>\n<\/span><\/span><span style=\"display: none;\" ><span>\n<svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"24\" height=\"24\" viewBox=\"0 0 24 24\">\n\t<path class=\"\" fill=\"currentColor\" stroke=\"currentColor\" d=\"M12,17.3l6.2,3.7l-1.6-7L22,9.2l-7.2-0.6L12,2L9.2,8.6L2,9.2L7.5,14l-1.6,7L12,17.3z\" \/>\n<\/svg>\n<\/span>\n<span>\n<svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"24\" height=\"24\" viewBox=\"0 0 24 24\">\n\t<path class=\"is-rating-unfilled\" fill=\"currentColor\" stroke=\"currentColor\" d=\"M12,17.3l6.2,3.7l-1.6-7L22,9.2l-7.2-0.6L12,2L9.2,8.6L2,9.2L7.5,14l-1.6,7L12,17.3z\" \/>\n<\/svg>\n<\/span><\/span><span style=\"display: none;\" itemprop=\"bestRating\" content=\"5\"><span>\n<svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"24\" height=\"24\" viewBox=\"0 0 24 24\">\n\t<path class=\"is-rating-unfilled\" fill=\"currentColor\" stroke=\"currentColor\" d=\"M12,17.3l6.2,3.7l-1.6-7L22,9.2l-7.2-0.6L12,2L9.2,8.6L2,9.2L7.5,14l-1.6,7L12,17.3z\" \/>\n<\/svg>\n<\/span>\n<span>\n<svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"24\" height=\"24\" viewBox=\"0 0 24 24\">\n\t<path class=\"is-rating-unfilled\" fill=\"currentColor\" stroke=\"currentColor\" d=\"M12,17.3l6.2,3.7l-1.6-7L22,9.2l-7.2-0.6L12,2L9.2,8.6L2,9.2L7.5,14l-1.6,7L12,17.3z\" \/>\n<\/svg>\n<\/span><\/span><span itemprop=\"ratingValue\" class=\"screen-reader-text\" content=\"3.5\">Note\u00a0: 3.5\u00a0sur 5.<\/span><\/div>\n<div class=\"twitter-share\"><a href=\"https:\/\/twitter.com\/intent\/tweet?via=ledza3\" class=\"twitter-share-button\">Tweet<\/a><\/div>\n","protected":false},"excerpt":{"rendered":"<p>Auteur : Dan Ariely J&rsquo;aime bien l&rsquo;\u00e9conomie comportementale, parce que je suis assez convaincu \u00e0 la fois de notre irrationalit\u00e9, et aussi de son c\u00f4t\u00e9 pr\u00e9visible. Ceci dit, mon avis personnel n&rsquo;a pas grand int\u00e9r\u00eat, surtout qu&rsquo;il est probablement nourri de mes cours d&rsquo;\u00e9co qui pr\u00e9tendaient tout rationnaliser dans des \u00e9quitations et des courbes. 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