A Hard Problem is a collective choice problem in which the only feasible alternatives apart from the status quo consist of a welfare gain to some people (the Winners) and a welfare loss to the others (the Losers). These problems are typical in a number of settings, such as climate action,...

A Hard Problem is a collective choice problem in which the only feasible alternatives apart from the status quo consist of a welfare gain to some people (the Winners) and a welfare loss to the others (the Losers). These problems are typical in a number of settings, such as climate action,...

Matching mechanisms have been proposed to mitigate underprovision of public goods in voluntary contribution models. This paper investigates Pareto-improving equilibria under various matching schemes with two heterogeneous players. First, this matching mechanism avoids free riding and each player...