In recent years, there has been widespread concern that misinformation on social media is damaging societies and democratic institutions. response, platforms have announced actions to limit the spread of false content. We measure trends in diffusion content from 569 fake news websites 9540 stories Facebook Twitter between January 2015 July 2018. User interactions with rose steadily both through end 2016. Since then, however, fallen sharply while continuing rise Twitter, ratio engagements...

We measure trends in the diffusion of misinformation on Facebook and Twitter between January 2015 July 2018. focus stories from 570 sites that have been identified as producers false stories. Interactions with these both rose steadily through end 2016. then fell sharply while they continued to rise Twitter, ratio engagements shares falling by approximately 60 percent. see no similar pattern for other news, business, or culture sites, where interactions relatively stable over time followed...

Abstract Physicians, judges, teachers, and agents in many other settings differ systematically the decisions they make when faced with similar cases. Standard approaches to interpreting exploiting such differences assume arise solely from variation preferences. We develop an alternative framework that allows preferences diagnostic skill show both dimensions may be partially identified standard under quasi-random assignment. apply this study pneumonia diagnoses by radiologists. Diagnosis...

Many retail platforms have recently expanded their advertising businesses, featuring sponsored products in search results. While product can enable sellers to reveal information, it also worsen results and raise prices. Using data on Amazon searches, purchases, auction bids, I estimate a model incorporating consumers, sellers, the platform evaluate welfare effects. Counterfactual analysis suggests that eliminating could benefit consumers under fixed commission rate, but would harm them if...

Abstract This article documents a robust pattern from diverse sequential bargaining settings: agents favor offers that split the difference between previous two offers. Our empirical settings include used cars, insurance claims, home sale, trade tariffs, TV game show, eBay, and auto‐rickshaws. These even‐split are more likely to be accepted, less spur exit by opponent, followed subsequent split‐the‐difference if continues. We propose several theoretical frameworks explain this behavior,...

We study the equilibrium effects of introducing competitive bidding in drug procurement. In 2019, China introduced a program where companies bid for prespecified procurement quantity nine provinces. Using difference-in-differences design, we show reduced average prices by 47.4 percent. Generic drugs won most bids and cut 75.0 develop an model to quantify trade-off between lower potential choice distortions. Competitive increases consumer welfare if policymakers believe consumers should value...

This paper uses detailed data on sequential offers from seven vastly different real-world bargaining settings to document a robust pattern: agents favor that split the difference between two most recent table. Our include negotiations for used cars, insurance injury claims, TV game show, auto rickshaw rides, housing, international trade tariffs, and online retail. We demonstrate this pattern can arise in perfect Bayesian equilibrium of an alternating-offer with two-sided incomplete...

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This paper investigates the welfare effects of vertical integration in China’s movie industry. We leverage data covering all theaters and 423 popular movies China during 2014–2018. find no evidence integrated being foreclosed to rival theaters. Integrated show for longer, allocate more screenings, charge lower prices. estimate a model consumers’ demand theaters’ screening decisions. internalize substantial fraction their upstream companies’ profits. Vertical mitigates distortions from...

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In the WEB2.0 environment, report of public events will appear on Internet as soon they occur and attract a large number peoples attention in very short time. It is believed that opinion represents social opinion. Hence, it valuable to study relationship between mass emergencies. this paper, we proposed an improved effect model spreading Different from original model, use variables parameters equation instead constants whole emergency divided into five stages. first two stages, new...

We measure trends in the diffusion of misinformation on Facebook and Twitter between January 2015 July 2018. focus stories from 570 sites that have been identified as producers false stories. Interactions with these both rose steadily through end 2016. then fell sharply while they continued to rise Twitter, ratio engagements shares falling by approximately 60 percent. see no similar pattern for other news, business, or culture sites, where interactions relatively stable over time followed...

We investigate the welfare effects of vertical integration in China's movie industry. leverage data covering all theaters and 423 popular movies China during 2014-2018. Integrated show their for longer, allocate more screenings, charge lower prices. There is no evidence integrated being foreclosed to rival theaters. estimate a model consumers' demand theaters' screening decisions. Vertical both mitigates distortions from revenue-sharing contracts crowds out independent movies. Overall,...

It is my great pleasure to present the 2023 Yearbook on Medical Informatics with a focus “Informatics for One Health”. This edition aims serve as beacon, guiding integration of technology, data, and interdisciplinary collaboration improving global health well-being.