Here's a quickly Googled source showing CPI-adjusted S&P 500: http://www.multpl.com/inflation-adjusted-s-p-500
Here's another quickly Googled source showing dividend-reinvested S&P 500 returns: http://www.indexologyblog.com/2013/08/08/inside-the-sp-500-d...
I wish I could find a decent source that incorporated both effects.
If everyone has to signal what percentile of competence they are, and you offer cheap loans to people who provide a certain signal, then everyone will start having to buying the service that send that signal. People are collectively blowing a lot of resources to signal the same thing (and irrespective of how much they value having such a vacation).
Scott Alexander provides a great exposition of that dynamic in "Against Tulip Subsidies": http://slatestarcodex.com/2015/06/06/against-tulip-subsidies...
I'm sympathetic to your greater point about keeping interest rates low, but it's simply not true that the US economy is weak by any of its own measures. The US economy is strong by many of its own measures:
US GDP is at its all-time high, $18 trillion. It has NEVER been higher.
The S&P 500 is near its all-time high, sitting around $2,000. Before last year, the S&P 500 had NEVER been higher.
For the past six quarters, US real GDP has been growing at about 3.0% annualized, far faster than the historical 1.9% annualized that the US experienced from 1860 to 2007 (a time period over which technology improved massively and the US became a global superpower).
US unemployment is down to 5%, back to the levels during the pre-recession boom.
By many, many measures, today's US economy is the strongest economy that humankind has ever seen. Certainly, the US economy is not as strong as it could be. And certainly, it would be nice if more people were employed. But overall, the US economy is doing better than ever.