The meteoric rise of artificial intelligence (AI) in the public conscience has caused many people to question what an AI-dominated future looks like. Will AI transform industries? If so, will it democratize or consolidate them? Will it create better or worse outcomes? Outlines of answers can be found in the world of finance which has been transformed in the last decade by the same forces driving AI: the diffusion of ever more powerful computing and the profusion of data. The experience of finance is both encouraging and sobering for an AI-dominated future. It suggests that AI will transform some (but not all) industries, that it will benefit larger players most, and that just as it makes individual players smarter, it may make the world dumber.