alt Hacker Newsyes, but could one also argue that due to currency weakening, the S&P's growth can simply be due to the weakened currency?
If I can say something has an "absolute" value of X, but I denominate it in USD, which is normally 1:1 to X, then it's value in USD in X.
but if USD drops to being worth half an X, but its absolute value hasn't changed, it will now appear to be worth 2X in USD.
so why can't one argue, if the dollar weakened by 15%, but everything else being equal, one would expect dollar denominated stocks to appreciate (in dollars) by the same amount? And if the dollar would strengthen, we would expect the stock price to depreciate?
Because the SP500 is a better indicator of the market than USD. Also if you look at the global dollar index, it is right at par historically.
The companies in the 500 are mostly global companies, if the USD shrunk so much they would either be losing money, or it doesn't matter because the US market is so strong it dwarfs the others.