“…For example, when contributing to a public good, it may be possible to make an initial non-refundable contribution and maintain the option of making additional contributions later, perhaps contingent on the contributions of others. And indeed such possibilities will expand the set of equilibrium outcomes, as can be seen from the work of Renou (2009), Bade, Haeringer, and Renou (2009), and more recently, Dutta and Ishii (2016), who specifically studied the power of partial commitments.…”