 However, it is not clear why Jeffrey’s point about real-world constraints would be relevant. What is wrong with evaluating a highly idealized game we have little reason to believe we will ever get to play? Hájek and Smithson (2012) point out that the St Petersburg paradox is contagious in the following sense: As long as you assign some nonzero probability to the hypothesis that the bank’s promise is credible, the expected utility will be infinite no matter how low your credence in the hypothesis is. Any nonzero probability times infinity equals infinity, so any option in which you get to play the St. Petersburg game with a nonzero probability has infinite expected utility.