By Arkady Petrov

RIO DE JANEIRO, BRAZIL - Civic honesty is essential to social capital and economic development but is often in conflict with material self-interest.

A study conducted in 40 countries computed a ratio based on the return of deliberately "lost" wallets; the more cash was contained in them, the more often they were returned.

At a time when the world seems to be permeated by corruption, is it feasible to measure the countries' level of honesty?

Driven by the urge to challenge common sense, three researchers from the United States and Switzerland invested in an innovative approach to . . .

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