This assumes that prediction of world events tracks stock performance well. Predicting the performance of stocks requires also predicting a lot of the noise in

This assumes that prediction of world events tracks stock performance well. Predicting the performance of stocks requires also predicting a lot of the noise in factors like the error in prediction made by other investors, what marketing moves are made by the people who have an interest in the company looking good in a given quarter, the degree to which companies will be manipulated by large-scale investors for reasons orthogonal to that companies ostensible business models... etc. Some quantitative finance algos obviously do well, but it's a different skill from predicting the coarser phenomena we call "world events". Also, if this all basically sounds like the economy is run like a mob casino... yes