{"id":178760,"date":"2025-09-12T11:36:38","date_gmt":"2025-09-12T09:36:38","guid":{"rendered":"https:\/\/www.ieseg.fr\/?post_type=events&#038;p=178760"},"modified":"2025-09-12T11:36:39","modified_gmt":"2025-09-12T09:36:39","slug":"irisk-research-seminar-measuring-common-ratio-effect","status":"publish","type":"events","link":"https:\/\/www.ieseg.fr\/en\/events\/irisk-research-seminar-measuring-common-ratio-effect\/","title":{"rendered":"[IRISK Research Seminar] Measuring Common-Ratio Effect"},"content":{"rendered":"\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" width=\"880\" height=\"280\" src=\"https:\/\/www.ieseg.fr\/wp-content\/uploads\/2024\/11\/banniere-conference-event-EN.jpg\" alt=\"\" class=\"wp-image-168110\" srcset=\"https:\/\/www.ieseg.fr\/wp-content\/uploads\/2024\/11\/banniere-conference-event-EN.jpg 880w, https:\/\/www.ieseg.fr\/wp-content\/uploads\/2024\/11\/banniere-conference-event-EN-300x95.jpg 300w, https:\/\/www.ieseg.fr\/wp-content\/uploads\/2024\/11\/banniere-conference-event-EN-768x244.jpg 768w, https:\/\/www.ieseg.fr\/wp-content\/uploads\/2024\/11\/banniere-conference-event-EN-150x48.jpg 150w, https:\/\/www.ieseg.fr\/wp-content\/uploads\/2024\/11\/banniere-conference-event-EN-400x127.jpg 400w\" sizes=\"(max-width: 880px) 100vw, 880px\" \/><\/figure>\n\n\n\n<p class=\"has-text-align-center\"><em><strong>September 26<sup>th<\/sup>, 2025<br><\/strong>2pm \u2013 3pm in Village Building (E033) &amp; on Zoom<\/em><br>&#8212;&#8212;&#8212;&#8212;&#8211;<br><em>Speaker:<strong> Arnaldo NASCIMENTO<\/strong>, Independent Researcher and Lecturer at IAG Business School<\/em><\/p>\n\n\n\n<h2>abstract<\/h2>\n\n\n\n<p>We introduce a formal measure for the common-ratio effect (CRE). Unlike previous approaches that relied on heuristic proxies, our measure precisely captures this fundamental factor. Through a logarithmic transformation of the probability weighting function, we develop a mathematically tractable measure that illuminates the relationship between the CRE and both the curvature and elasticity of the weighting function. Our framework defines comparative CRE measures, enabling both local and global comparisons, and establishes new families of weighting functions that exhibit constant absolute (CACRE) and constant relative (CRCRE) common-ratio effects. We also provide a discrete measure suitable for nonparametric applications. We establish a fundamental connection between CRE and intertemporal choice: the degree of subproportionality directly corresponds to the degree of decreasing impatience, creating a one-to-one mapping between CACRE\/CRCRE and Constant Absolute\/Relative Decreasing Impatience (CADI\/CRDI) discount functions. Additionally, our measurement framework extends to analyze the subproportionality of utility functions, linking it to utility elasticity and Arrow-Pratt risk aversion.<\/p>\n\n\n\n<p class=\"has-text-align-center\"><em><strong><a href=\"https:\/\/acrobat.adobe.com\/id\/urn:aaid:sc:EU:d4dc94ab-ff6d-456b-a609-6adb407b0956\" target=\"_blank\" rel=\"noreferrer noopener\">More info<\/a><\/strong><\/em><\/p>\n","protected":false},"excerpt":{"rendered":"<p>September 26th, 20252pm \u2013 3pm in Village Building (E033) &amp; on Zoom&#8212;&#8212;&#8212;&#8212;&#8211;Speaker: Arnaldo NASCIMENTO, Independent Researcher and Lecturer at IAG Business School abstract We introduce a formal measure for the [&hellip;]<\/p>\n","protected":false},"featured_media":0,"template":"","events-category":[41,166],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v19.2 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>[IRISK Research Seminar] Measuring Common-Ratio Effect - I\u00c9SEG<\/title>\n<meta name=\"description\" content=\"September 26th, 20252pm \u2013 3pm in Village Building (E033) &amp; on Zoom--------------Speaker: Arnaldo NASCIMENTO, Independent Researcher and Lecturer at\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.ieseg.fr\/en\/events\/irisk-research-seminar-measuring-common-ratio-effect\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"[IRISK Research Seminar] Measuring Common-Ratio Effect - I\u00c9SEG\" \/>\n<meta property=\"og:description\" content=\"September 26th, 20252pm \u2013 3pm in Village Building (E033) &amp; on Zoom--------------Speaker: Arnaldo NASCIMENTO, Independent Researcher and Lecturer at\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.ieseg.fr\/en\/events\/irisk-research-seminar-measuring-common-ratio-effect\/\" \/>\n<meta property=\"og:site_name\" content=\"I\u00c9SEG\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/pages\/IESEG-School-of-Management\/358733860458?fref=ts\" \/>\n<meta property=\"article:modified_time\" content=\"2025-09-12T09:36:39+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.ieseg.fr\/wp-content\/uploads\/2024\/11\/banniere-conference-event-EN.jpg\" \/>\n<meta name=\"author\" content=\"Anna BARRALIS\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:site\" content=\"@IESEG\" \/>\n<meta name=\"twitter:label1\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data1\" content=\"2 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Organization\",\"@id\":\"https:\/\/www.ieseg.fr\/#organization\",\"name\":\"Ieseg\",\"url\":\"https:\/\/www.ieseg.fr\/\",\"sameAs\":[\"https:\/\/www.linkedin.com\/edu\/school?id=12453\",\"https:\/\/www.youtube.com\/user\/IESEGChannel\",\"https:\/\/www.facebook.com\/pages\/IESEG-School-of-Management\/358733860458?fref=ts\",\"https:\/\/twitter.com\/IESEG\"],\"logo\":{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\/\/www.ieseg.fr\/#\/schema\/logo\/image\/\",\"url\":\"https:\/\/www.ieseg.fr\/wp-content\/uploads\/IESEG-Logo-2012-rgb.jpg\",\"contentUrl\":\"https:\/\/www.ieseg.fr\/wp-content\/uploads\/IESEG-Logo-2012-rgb.jpg\",\"width\":\"1000\",\"height\":\"311\",\"caption\":\"Ieseg\"},\"image\":{\"@id\":\"https:\/\/www.ieseg.fr\/#\/schema\/logo\/image\/\"}},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/www.ieseg.fr\/#website\",\"url\":\"https:\/\/www.ieseg.fr\/\",\"name\":\"I\u00c9SEG\",\"description\":\"School of Management\",\"publisher\":{\"@id\":\"https:\/\/www.ieseg.fr\/#organization\"},\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\/\/www.ieseg.fr\/?s={search_term_string}\"},\"query-input\":\"required name=search_term_string\"}],\"inLanguage\":\"en-US\"},{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\/\/www.ieseg.fr\/en\/events\/irisk-research-seminar-measuring-common-ratio-effect\/#primaryimage\",\"url\":\"https:\/\/www.ieseg.fr\/wp-content\/uploads\/2024\/11\/banniere-conference-event-EN.jpg\",\"contentUrl\":\"https:\/\/www.ieseg.fr\/wp-content\/uploads\/2024\/11\/banniere-conference-event-EN.jpg\",\"width\":880,\"height\":280},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.ieseg.fr\/en\/events\/irisk-research-seminar-measuring-common-ratio-effect\/#webpage\",\"url\":\"https:\/\/www.ieseg.fr\/en\/events\/irisk-research-seminar-measuring-common-ratio-effect\/\",\"name\":\"[IRISK Research Seminar] Measuring Common-Ratio Effect - I\u00c9SEG\",\"isPartOf\":{\"@id\":\"https:\/\/www.ieseg.fr\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\/\/www.ieseg.fr\/en\/events\/irisk-research-seminar-measuring-common-ratio-effect\/#primaryimage\"},\"datePublished\":\"2025-09-12T09:36:38+00:00\",\"dateModified\":\"2025-09-12T09:36:39+00:00\",\"description\":\"September 26th, 20252pm \u2013 3pm in Village Building (E033) &amp; 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