Some bitcoin proponents have argued that governments cannot really prevent bitcoin use. Jon Matonis once stated that “a government ban on bitcoin would be about as effective as alcohol prohibition was in the 1920s.” How could a government prevent people from using bitcoin? It’s online. It’s pseudonymous. And, as Matonis notes, “demand for an item […] does not simply evaporate in the face of a jurisdictional ban.” Or, does it? For starters, one must recognize that monetary demand — that is, the demand to use an item as a medium of exchange — is not quite like the demand for most other goods. Monies are subject to network effects. I can enjoy a fine bathtub gin even if no one else does. But the usefulness of a would-be money like bitcoin depends crucially on whether other people are using it. We must coordinate beliefs. If one does not believe others will use bitcoin, she will be less inclined to accept it herself. For cryptocurrencies that lack some non-monetary use, that means demand might fall to zero even if everyone would prefer it to the relevant alternative.