{"id":12532,"date":"2026-10-27T13:39:30","date_gmt":"2026-10-27T04:39:30","guid":{"rendered":"https:\/\/www.waseda.jp\/fpse\/winpec\/?p=12532"},"modified":"2026-11-03T11:43:56","modified_gmt":"2026-11-03T02:43:56","slug":"ueda-k-watanabe-k-restaurant-prices-measuring-service-inflation-from-scanner-data","status":"publish","type":"post","link":"https:\/\/www.waseda.jp\/fpse\/winpec\/news\/2026\/10\/27\/12532\/","title":{"rendered":"<strong>Ueda, K., <\/strong>&#038; Watanabe, K.<br><br><strong> <strong>Restaurant Prices: Measuring Service Inflation from Scanner Data"},"content":{"rendered":"<p><a href=\"https:\/\/doi.org\/10.1111\/roiw.70072\" target=\"_blank\" rel=\"noopener\">Ueda, K., &amp; Watanabe, K. (2026). Restaurant Prices: Measuring Service Inflation from Scanner Data. <em>Review of Income and Wealth,<\/em> 72(2), e70072.<\/a><\/p>\n<p><strong>\u89e3\u8aac\/Abstract<br \/>\n<\/strong>\u79c1\u305f\u3061\u306e\u5916\u98df\u8cbb\u306f\u3001\u5b9f\u969b\u306b\u3069\u308c\u3060\u3051\u5024\u4e0a\u304c\u308a\u3057\u3066\u3044\u308b\u306e\u3067\u3057\u3087\u3046\u304b\uff1f\u653f\u5e9c\u306e\u7269\u4fa1\u7d71\u8a08\uff08CPI\uff09\u306f\u3001\u305f\u3068\u3048\u3070\u300c\u5bff\u53f8\u300d\u30ab\u30c6\u30b4\u30ea\u30fc\u306b\u5bfe\u3057\u3066\u5168\u56fd\u3067\u305f\u3063\u305f\u4e00\u7a2e\u985e\u306e\u4fa1\u683c\u3057\u304b\u8abf\u67fb\u3057\u307e\u305b\u3093\u3002\u3053\u306e\u65b9\u6cd5\u3067\u672c\u5f53\u306b\u5b9f\u614b\u3092\u6349\u3048\u3089\u308c\u3066\u3044\u308b\u306e\u304b\u3001\u7591\u554f\u304c\u6b8b\u308a\u307e\u3059\u3002<br \/>\n\u672c\u7814\u7a76\u3067\u306f\u3001\u5168\u56fd\u7d041000\u5e97\u8217\u306e\u30ec\u30b9\u30c8\u30e9\u30f3\u306e2018\u5e74\u304b\u30892025\u5e74\u306b\u308f\u305f\u308b\u6ce8\u6587\u30c7\u30fc\u30bf\u3092\u5206\u6790\u3057\u3001\u3088\u308a\u7cbe\u7dfb\u306a\u5916\u98df\u4fa1\u683c\u6307\u6570\u3092\u69cb\u7bc9\u3057\u307e\u3057\u305f\u3002\u305d\u306e\u7d50\u679c\u3001\u516c\u5f0fCPI\u306f\u6982\u306d\u4fe1\u983c\u3067\u304d\u308b\u3053\u3068\u304c\u78ba\u8a8d\u3055\u308c\u307e\u3057\u305f\u3002<br \/>\n\u3055\u3089\u306b\u672c\u7814\u7a76\u3067\u306f\u3001\u4e00\u54c1\u3054\u3068\u3067\u306f\u306a\u304f\u30c6\u30fc\u30d6\u30eb\u5168\u4f53\u306e\u652f\u6255\u984d\u3092\u8ffd\u8de1\u3059\u308b\u300c\u30c6\u30fc\u30d6\u30eb\u4fa1\u683c\u6307\u6570\u300d\u3092\u65b0\u305f\u306b\u958b\u767a\u3057\u307e\u3057\u305f\u3002\u5916\u98df\u3067\u306f\u3001\u4e00\u54c1\u3060\u3051\u6ce8\u6587\u3059\u308b\u3053\u3068\u306f\u307b\u3068\u3093\u3069\u306a\u304f\u3001\u8907\u6570\u306e\u6599\u7406\u3092\u7d44\u307f\u5408\u308f\u305b\u3066\u98df\u4e8b\u3092\u697d\u3057\u3080\u306e\u304c\u4e00\u822c\u7684\u3067\u3059\u3002\u3053\u306e\u6307\u6570\u3092\u8a08\u7b97\u3057\u305f\u3068\u3053\u308d\u3001\u901a\u5e38\u306e\u4fa1\u683c\u6307\u6570\u3088\u308a\u5e74\u9593\u7d041\u30dd\u30a4\u30f3\u30c8\u9ad8\u3044\u30a4\u30f3\u30d5\u30ec\u7387\u304c\u793a\u3055\u308c\u307e\u3057\u305f\u3002\u3053\u306e\u5dee\u306e\u4e00\u56e0\u3068\u3057\u3066\u8003\u3048\u3089\u308c\u308b\u306e\u304c\u300c\u30b7\u30e5\u30ea\u30f3\u30af\u30d5\u30ec\u30fc\u30b7\u30e7\u30f3\u300d\u3001\u3064\u307e\u308a\u4fa1\u683c\u3092\u5909\u3048\u305a\u306b\u5206\u91cf\u3092\u6e1b\u3089\u3059\u73fe\u8c61\u3067\u3059\u3002\u5206\u91cf\u304c\u6e1b\u308c\u3070\u3001\u540c\u3058\u6e80\u8db3\u611f\u3092\u5f97\u308b\u305f\u3081\u306b\u8ffd\u52a0\u6ce8\u6587\u304c\u5897\u3048\u3001\u7d50\u679c\u3068\u3057\u3066\u30c6\u30fc\u30d6\u30eb\u5168\u4f53\u306e\u652f\u6255\u984d\u304c\u5897\u52a0\u3057\u307e\u3059\u3002\u516c\u5f0f\u7d71\u8a08\u306e\u4fa1\u683c\u6307\u6570\u306b\u306f\u53cd\u6620\u3055\u308c\u306b\u304f\u3044\u3001\u96a0\u308c\u305f\u5024\u4e0a\u304c\u308a\u304c\u5b9f\u969b\u306b\u306f\u8d77\u304d\u3066\u3044\u308b\u53ef\u80fd\u6027\u3092\u3001\u3053\u306e\u7814\u7a76\u306f\u793a\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>How much have restaurant prices really gone up? When measuring dining-out inflation, the official Consumer Price Index (CPI) surveys only a single representative dish per category. For instance, just one type of sushi to represent the entire sushi category nationwide. This raises a natural question: can such limited sampling truly reflect what is happening across the full range of restaurants?<br \/>\nThis study analyzes order-level data from approximately 1,000 restaurants across Japan, covering 2018 to 2025, to construct a more detailed picture of restaurant price trends. The results are partly reassuring: the official CPI turns out to be broadly reliable, tracking closely with indices built from the full dataset.<br \/>\nHowever, the study also introduces a new measure called the &#8220;Table Price Index,&#8221; which tracks total spending per dining group rather than the prices of individual dishes. This better reflects how people actually eat out. That is, people rarely order just one item, but instead share multiple dishes across a meal. When calculated this way, inflation runs approximately one percentage point higher per year than conventional indices suggest. Part of this gap may be explained by &#8220;shrinkflation&#8221;, which means the practice of quietly reducing portion sizes without raising the listed price. Smaller portions mean customers need to order more dishes to feel satisfied, pushing up the total bill even when no individual price tag has changed. This study suggests that the true cost of dining out may be rising faster than official statistics reveal.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Ueda, K., &amp; Watanabe, K. (2026). Restaurant Prices: Measuring Service Inflation from Scanner Data. Review  [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":12903,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[],"tags":[102,66,101,32],"class_list":["post-12532","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","tag-general-en","tag-research-en","tag-general","tag-research"],"acf":[],"_links":{"self":[{"href":"https:\/\/www.waseda.jp\/fpse\/winpec\/wp-json\/wp\/v2\/posts\/12532","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.waseda.jp\/fpse\/winpec\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.waseda.jp\/fpse\/winpec\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.waseda.jp\/fpse\/winpec\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.waseda.jp\/fpse\/winpec\/wp-json\/wp\/v2\/comments?post=12532"}],"version-history":[{"count":2,"href":"https:\/\/www.waseda.jp\/fpse\/winpec\/wp-json\/wp\/v2\/posts\/12532\/revisions"}],"predecessor-version":[{"id":12579,"href":"https:\/\/www.waseda.jp\/fpse\/winpec\/wp-json\/wp\/v2\/posts\/12532\/revisions\/12579"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.waseda.jp\/fpse\/winpec\/wp-json\/wp\/v2\/media\/12903"}],"wp:attachment":[{"href":"https:\/\/www.waseda.jp\/fpse\/winpec\/wp-json\/wp\/v2\/media?parent=12532"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.waseda.jp\/fpse\/winpec\/wp-json\/wp\/v2\/categories?post=12532"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.waseda.jp\/fpse\/winpec\/wp-json\/wp\/v2\/tags?post=12532"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}