They examine the labor supply of politicians in the European Parliament where the introduction of a law equalized salaries, which had previously differed by as much as a factor of ten. They find that:
- Doubling an member of parliament's (MP) salary increases the probability that she runs for reelection by 21 percentage points
- A salary increase, however, lowers the quality of elected MPs, measured by the selectivity of their undergraduate institutions.
- Higher pay does not affect effort, measured by legislative sessions attended while in office.