But perhaps the biggest change to economics this century is the so-called "credibility revolution", as researchers eschewed theoretical models in favour of empirical approaches. Methodology such as difference-in-differences and randomised controlled trials have cemented their place in the literature But as economics has come to resemble a "hard science", worries about replicability abound, with research suggesting that up to 70 per cent of recently examined economics papers contain some results that cannot be reproduced. Can the academy keep a close eye on rigour as the subject evolves? Me for the @FT: ft.com/content/ea4d4326-878d…