Why money hoarding should be banned

Is money expiration fair? Many first time readers of One Month Money have answered this question with a clear “no.” They claim that prohibiting money hoarding is fundamentally unjust, that since we earned our money through hard work we should do with it as we please — splurge, save, stick it under the mattress for forty years, whatever we want.

While I offer a number of counter arguments in the book, one approach was lost in the redrafting process, and it recently came up in a heated discussion with a former colleague. The key question is: why should money I earned forty years ago have value today?