This was a news item I missed when I was at the Robotics/AI conference a week or so ago but, IBM has built AI programs that are apparently better than humans at commodities trading.
One could make the argument that, as financial expert systems and computer models of the economy improve, and there are strong incentives in business to fund this sort of research, we will give over more and more control of our economy to software. Ever since Crash of 1987, stock trading programs used by big brokerages have been written to shutdown if they spot negative feedback loops that might trigger a stock market crash. Who knows where this is all headed?