This article reports on an experiment that was designed to test predictions about the frequency of disagreement (strikes) in games with complete information. An empirical test of the "joint-cost" theory, which relates strike activity to the marginal cost of striking, is based on a set of "shrinking pie" games in which subjects bargained in consecutive periods over how to divide a sum of money. Strike activity was a frequent occurrence in these games and, moreover, did not disappear over time. The joint-cost theory received some support, indicating that further tests may be useful.