Note that it's even higher now on the end of that chart, so push it to 18,000 and you've got the comparison.
That chart, at a bare minimum, whether you think we're dealing with "irrational exuberance" or not, should tell you that we're in an exceptional period in the stock market.
Chart two, federal funds rate, 1954 through 2009: http://upload.wikimedia.org/wikipedia/commons/thumb/3/31/Fed...
That funds rate is still that low. Whether you think it's too low or not, it's pretty obvious that this is an exceptional period for access to low-interest money.
I'm watching the real estate market spike up much faster than wages (again), and billions get poured into tech companies who's business model really just isn't there and/or heavily depends on advertising (advertising rates collapsed after 2000, by a lot). I was worried about the valuations a year ago, and now they're even higher. And of course, it's pushing a lot of private valuations up too. The more money publicly traded corporations have, the better your chances of selling a private company at a high value, or going public without good fundamentals.
I think there's just too much money sloshing around right now. Excess money doesn't go into CPI anymore, it more often creates valuation fevers. I don't think the overnight rates should have been this low for so long. And I'm pretty worried about what's going to happen when they finally start raising them, but not as worried as what happens if they continue to leave them as-is.