Ricardo A. M. R. Reis (born 1 September 1978) is a Portuguese economist and the A. W. Phillips professor of economics at the London School of Economics. In a 2013 ranking of young economists by Glenn Ellison, Reis was considered the top economist with a PhD between 1996 and 2004., and in 2016 he won the Germán Bernácer Prize for top European-born economist researching macroeconomics and finance. He writes a weekly op-ed for the Portuguese newspaper Jornal de Notícias and Expresso, and participates frequently in economic debates in Portugal. Academic career Reis earned his Bachelor of Science (B.Sc.) degree from the London School of Economics in 1999, and his Doctor of Philosophy (Ph.D.) from Harvard University in 2004. He taught at Princeton University from 2004 to 2008 before moving to Columbia University where he became a full professor at the age of 29, one of the youngest ever in the history of the university. He is an academic advisor and visiting scholar at central banks around the world, and sits on the board of multiple institutions. Economic contributions Sticky information and inattentiveness In 2002, with Gregory Mankiw, Reis proposed the sticky-information Phillips curve and followed it later with rational theories of inattention, and sticky-information models in general equilibrium. Empirical study of disagreement in surveys In 2004, with Gregory Mankiw and Justin Wolfers, Reis started the modern empirical literature that focuses on disagreement in surveys. Pure inflation In 2010, with Mark Watson, Reis developed measures of pure inflation, which have become popular measures of core inflation used by central banks around the world. The diabolic loop and ESBies In 2011, Reis with Markus Brunnermeier, Luis Garicano, Philip R. Lane and others, argued that banks holding significant amounts of bonds issued by their sovereign creates a "diabolic loop", whereby small changes in the perceived solvency of the sovereign can amplify into large crises. This concept has become central in accounts of the Euro crisis and is also referred to as the "doom loop" or the "bank-government nexus". They proposed creating European Safe Bonds (ESBies), a new financial vehicle allowing banks in the Eurozone to break the diabolic loop without creating the problems of joint and several liability with Eurobonds. The European Systemic Risk Board proposed a variant of ESBies, labelled Sovereign Bond-Backed Securities (or SBBS) as a crucial ingredient to have a more stable Eurozone. HANK models In 2012, Reis wrote the