The 2008 financial crash was the single biggest upwards movement of wealth in human history. It happened because one method of extracting wealth from the poor (mortgages: imagine loans but riskier, and with even fewer safety nets, and its for something you need to survive without dying of exposure) conflicts and becomes terminally incompatible with another. That being, the labor value of those people cannot ever pay what you are demanding. Boom! Suddenly the whole thing comes crashing down, line goes down! What is to be done of couse? Why, seize all the assets, give billions of dollars to the banks, and do it all over again of course!