  We study the mechanism design problem of selling a public good to a group of
agents by a principal in the correlated private value environment. We assume
the principal only knows the expectations of the agents' values, but does not
know the joint distribution of the values. The principal evaluates a mechanism
by the worst-case expected revenue over joint distributions that are consistent
with the known expectations. We characterize maxmin public good mechanisms
among dominant-strategy incentive compatible and ex-post individually rational
mechanisms for the two-agent case and for a special $N$-agent ($N>2$) case.
