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Pierre Dubois, Paulo Albuquerque, Olivier Allais, Céline Bonnet, Patrice Bertail, P. Compris, Saadi Lahlou, Nathalie Rigal, Bernard Ruffieux et Pierre Chandon
n° 20-1088, avril 2020
To examine whether four pre-selected front-of-pack nutrition labels improve food purchases in real-life grocery shopping settings, we put 1.9 million labels on 1,266 food products in four categories in 60 supermarkets and analyzed the nutritional quality of 1,668,301 purchases using the FSA...
Kelly Fielding, Céline Nauges et Sarah Ann Wheeler
n° 20-1086, avril 2020
Although past findings are inconclusive, there is evidence of a negative relationship between wealth—at the household and country level—and climate change concern. One explanation for this relationship is that wealth provides a buffer against the risks of climate change, leading people in wealthy...
Zachary Garfield et Edward H. Hagen
vol. 31, n° 2, avril 2020
Jérôme Bolte et Edouard Pauwels
avril 2020, p. 1–33
Modern problems in AI or in numerical analysis require nonsmooth approaches with a exible calculus. We introduce generalized derivatives called conservative fields for which we develop a calculus and provide representation formulas. Functions having a conservative field are called path...
Alberto Micheletti
vol. 2, n° 10, avril 2020, 5 pages
One of the difficulties with cultural group selection theory highlighted in the review by Smith (2020, Evol. Hum. Sci., 2, e7) is its inability to separate the evolutionary effects of selection of cultural traits based on biological fitness (Cultural Selection 1) from the effects of selection based...
Philippe Alby, Emmanuelle Auriol et Pierre Nguimkeu
vol. 87, n° 346, avril 2020, p. 299–327
In the absence of a public safety net, wealthy Africans have the social obligation to share their re- sources with their needy relatives in the form of cash transfers and inefficient family hiring. We develop a model of entrepreneurial choice that accounts for this social redistributive constraint...
Pascal Bégout
vol. 2020, n° 39, 28 avril 2020, p. 1–18
Elias Carroni, Leonardo Madio et Shiva Shekhar
n° 20-1083, mars 2020, révision juillet 2020
This article studies incentives for a premium provider (Superstar) to offer exclusive contracts to competing platforms mediating the interactions between consumers and firms. When platform competition is intense, more consumers affiliate with the platform favored by Superstar’s exclusive deal. This...
Elisabetta Iossa, Simon Loertscher, Leslie Marx et Patrick Rey
n° 20-1084, mars 2020
Collusive schemes by suppliers often take the form of allocating customers or markets among cartel members. We analyze incentives for suppliers to initiate and sustain such a collusive schemes in a repeated procurement setting. We show that, contrary to some prevailing beliefs, staggered (versus...
Christian Gollier et Olivier Gossner
mars 2020
It is well-known that group testing is an efficient strategy to screen for the presence of a virus. It consists in pooling n individual samples with a single test using RT-PCR. If at least one individual is infected, the test is positive, and it is negative otherwise. We show how group testing can...
