mathematically stock splits create no value splitting your stock 20for1—a move amazon announced last week—isn’t really any different than swapping a 20 bill for 20 singles your wallet might be a little fatter but you aren’t any richer the fact that split announcements often spur stock prices to rally isn’t logical that said there is academic research showing the split effect is real and could signal management confidence sure enough amazoncom ticker amzn rallied after it announced its split along with a largely