When I was playing dying light with friend we discovered that every timw you go to sleep and wake up air drop will appear, if you don’t know air drops are pretty rare and if you collext them and deliver to one guy you will recieve lots of xp, we used that multiple times to unlock grapling hook very early. Air drops also gave lots of medicine which was hard to get in early game and that very helped us
In one of the old Superpower strategy games, you could set the income tax modifier to 100% and basically break your economy and have a ridiculously high income, though I think if you played long enough it would eventually come back down to “normal”, but it’s easily enough to get you out of some crazy bad national debt