An experimental test of whether financial incentives constitute undue inducement in decision-making.

Raising the incentive caused participation to increase by 33 percentage points (from 38% to 71%; t -test, t = 8.14, P = 0.000) when participants could select a video but by only 23 percentage points (from 36% to 59%; t -test, t = 4.51, P = 0.000) when they could not, though the difference in differences did not reach statistical significance ( t -test, t = 1.62, P = 0.105).

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