Start investing money so when they take their money out of the account their
income will be a lot higher then when it started<span />
It would refer to a number of related phenomena and patterns of change.
It was caused by a mix of different scenarios. Rome was constantly attacked by Barbarian tribes; they were over-expanded, which made it really hard for them to keep their entire empire under control; they had a lot of economic problems and relied too much on slave labor; and they spent way too much money on their military, just to name a few factors.
