We test the turnout predictions of the standard two-party, private value, costly voting model through a large-scale, real effort experiment. We do this by recruiting 1,200 participants through Amazon's Mechanical Turk and employing a 2 x 2 between subjects design encompassing small (N = 30) and large (N = 300) elections, as well as close and one-sided elections. We find partial evidence of selfish instrumental voting. Participants with a higher opportunity cost are less likely to vote (cost effect); turnout rate decreases as the electorate size increases (size effect) in one-sided elections and increases the closer the election is (competition effect) in large elections. Contrary to the theoretical predictions, in large one-sided elections the majority turns out to vote at a higher rate than the minority. We propose an alternative theory assuming that voters obtain a small non-monetary utility if they vote and their party wins.
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