+ x−k) (1)
Public Choice (2012) 151:91–119 95
with k = 1,2, and −k = 1 if k = 2, −k = 2 if k = 1. The variables xik and x−k are the
contributions to the public good of subject i as mover k and mover −k, respectively. The
contribution of the first mover is an integer x1 ∈ [0,10] and that of the second mover takes
one of the two values x2 ∈ {0, x1}.
2.2 Theoretical predictions
As noted
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