In principle, there are only three main components of spending that much matter to monetary policy: consumer spending, business investment and exports and trade.
You get ideas from daydreaming. You get ideas from being bored. You get ideas all the time. The only difference between writers and other people is we notice when we're doing it.
A corporation's primary goal is to make money. Government's primary role is to take a big chunk of that money and give it to others.