How is MDY at an all-time high? The tail wagging the dog as the ETF drags its underlying stocks up instead of the other way around.
Check IWM It follows this one pretty well. at a lower price.
Morningstar has a great tool in their charting, shows the growth of a 10k investment with dividends reinvested, going back to 1996, MDY is up 510%, $10k invested then would now be worth $51k.