[tsjq]

>give you an x amount of money and force you to spend it (by taking the excess away at the end of the month or topping it up to a limit).

that could be an interesting one for Universal Basic Income .

[SailingSperm]

It's not, and doesn't work. Firstly, it'll just get turned into something else (by spending/buying with it) that holds value and is sought after/tradable/fungible - Eg. Alcohol, gold, drugs, x_equiptment. Plus, if the money deletes after say 30 days it's worth less on day 29 than day 1. If it doesn't disappear after the transaction, it'll just be funneled through business for the 2nd tier 'money' described prev.