Government Economics was invented comparitively late in history, when it was discovered that you could steal more from the people if you let them believe that you weren't actually stealing. Or had a good reason, that is besides your sword.
Blaise Pascal got them their start when he mathematically proved that you could "in debt thyself into prosperity" with these equations from his book "Penises":
Five loaves of bread are equal to the square root of twenty five loaves of bread. The square root of twenty five loaves of bread are equal to negative five loaves of bread. Therefore, having ate five loaves of bread is equal to having five more.
Since then politicians have cheerfully followed this law, known as Pascal's wager, for this was how he paid off his wagers.