In this game, participants are given endowments of tokens that
may either be kept or contributed to a public good. Each token has a specified value if kept,
but the value if contributed depends on others' contributions.
If the total contributions exceed a
pre-announced target level, then the public good is provided and each person receives a
fixed monetary reward, regardless of whether or how much they contributed. So individual investment is
costly, but it may pay off if it pushes the total contribution above the "provision point." If the provision point is
not reached, then contributions are either refunded or not, depending on the setup option that you select.
Notice that the provision point introduces a "step" in the payoff function,
and multiple provision-point steps are permitted. The discrete nature of the
step-function payoffs is motivated by the discrete nature of some public goods, e.g.
whether or not a park is provided.
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Provision points may (in some cases) provide a solution to the
"free riding" that
generates inefficiently low levels of public good provision,
a problem that has been on economists' minds at least
since Adam Smith's famous observations about street lights.
Vecon Lab - March 7, 2014