Celebrity culture... it's the evaluation of someone who serves no real purpose as significantly more important than those who work to support them, and then the celebs just gob it all back in their faces
Either this or the economy, and savings, which have screwed everyone over with this recession, because the mega-rich hoard all the money so that everyone else gets nothing. If the money is spent then it still exists, whereas if it's just left to gather dust in someone's account then, whilst prices still rise, the money disappears from those lower down the chain of evil (also known as the economy) so that they cannot afford to buy anything, but when they do, it all goes to the mega bank accounts
Maybe even the industrial revolution, which has increased the production of food and many other things, whilst reducing the numbers of people involved in the production procedure, and thus there are less jobs these days causing the increased unemployment, though this fits more in with the previous one, and also in a way with another one: slavery, which I'm surprised hasn't really been mentioned (aside from with religion and war, which is potentially linkable to this)