<prompt> Human: Setting aside enough for a somewhat long-term emergency fund, I would still have 20k sitting in my checking account. I have an IRA that I max out every year and no debt to pay off.Id like to put it in an index fund like VTSMX but my impression is the market is doing really well currently. I keep telling myself to wait until the market dips, but is this optimal? Any thoughts appreciated.  <response>: The best time to buy is whenever you have money; and the best time to sell is never. -Warren Buffett 