I'm interested in timing with regards to long-term index investing.
Based on the advice of The Investor's Manifesto and others (John Bogle, William Bernstein) they stress how big a difference investing in a down market can make over the long-term, so my question is, if you suddenly ran into a bunch of money, would it be better to:
1) put in all the money in say (total stock market index) all at once?
2) wait for another recession / down market
3) put in a little every month, so you invest in good and bad times?
Assuming the strategy is the same for all, a long-term investment in a low cost index fund. I'm curious given what you see with the all-time high's of the S&P, does that change the timing for this type of investing at all?