List and Momeni hired more than 3,000 gig workers through Amazon Mechanical Turk, a crowdsourcing marketplace, to complete transcription tasks. They paid workers part of their wages upfront, a decision made intentionally to encourage misbehavior. The researchers figured that some participants (who didn’t know they were part of a study), with payment in hand, would simply not do any work—or might cheat by reporting images for transcription as unreadable.

http://review.chicagobooth.edu/strat...y-can-backfire