Although it is possible for a few experts to successfully arbitrage the market for an unusually large return, this does not mean that a larger number could earn the same returns even given the same tools, techniques, and data sources. This is because the arbitrages are essentially drawn from a pool of finite size; although information about how to capture arbitrages is a nonrival good, the arbitrages themselves are a rival good. In analogy: the total amount of buried treasure on an island is the same, regardless of how many treasure hunters have bought copies of the treasure map.