This trick can give you a decent amount of money each year. Essentially, it tricks the game into paying you interest instead of the other way around. You should not build anything before using this trick. If you do, it may not work. Type fund then press ENTER to accept the bond. Repeat and accept another bond. Go into the "Budget" window (with taxes, funding and bond information). Click on the book icon under "Bond Payments". It will bring up a screen that shows your current fund ratings. Click on "Issue Bond". The rate should be ".%". Accept it. Exit the Budget window, then turn the speed on "Cheetah". You should accumulate about $1.5 million each year.