The stock market is not the economy.
In my personal view 'The Market's purely reflect consumer confidence. They appear divorced from actual reality, aside from how that affects the mindset of easily panicked lemmings.
And the stock market varies wildly on a daily and monthly basis without affecting the prices of almost anything.
It seems clear to me that money is not even close to affected by consumer confidence the way the stock market is.
T-shirts, on the other hand, much more slowly change to match confidence, for the same reasons. If you think people collectively over- or undervalue T-shirts, it is rather hard to make money off of that mistake. In part because it implies moving physical stock, but also because they are a relatively refined product. Markets for natural resources see some of the same fluctuations as stock markets, although not to the same degree.