A household could also just spend money hoping to increase next year's income (because you bought a bigger car or a new suit/dress). If that works, you'll also

A household could also just spend money hoping to increase next year's income (because you bought a bigger car or a new suit/dress). If that works, you'll also "come out ahead". But it usually doesn't, I guess. For taxation, you might consider stock market investments a similar thing "oh sure, I spend money here, but by doing so I stimulate the economy and I get dividends from my shares". Of course, they can't just declare themselves shareholders of other companies and send in the cops to collect money, that's a state-level privilege.