We know from chaos theory that even if you had a perfect model of the world, you'd need infinite precision in order to predict future events. With sociopolitical or economic phenomena, we don't have anything like that.
Love without sacrifice is like theft
True, our knowledge does grow, but it is threatened by greater increases in confidence, which make our increase in knowledge at the same time an increase in confusion, ignorance, and conceit.
The world we live in is vastly different from the world we think we live in.
Never think that lack of variability is stability. Don't confuse lack of volatility with stability, ever.
Governments that try to shoot for a surplus hardly ever reach it.