From Forbes:

...[T]he top income tax rate was 91% in the 1950s, but the S&P 500 rose 245%. On the other hand, the combined federal tax on income and investment during the presidency of George W. Bush was lower than at any time post-World War II. Despite the relatively low tax burden, the S&P fell 36% on Bush's watch.

So what's the hidden variable to our economic health?

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