<prompt> Human: Hi all,Im a very simple, broad index investor just max out my 401k, and basically just buy vanguard total stock market vanguard total international stock market.I know in almost all cases, you should never try to time the market. Waiting for dips has definitely cost me a lot of money.With that said, are there any metrics or indicators, when at a certain level would be SO out of whack that it would just make sense to wait?Im currently only at around 80 equities right now because things look oversold.The main 2 metrics Im looking at:- TMC to GDP ratio Buffett indicated this was one of the best simple metrics: - indicating that the market is currently significantly overvalued- Schiller PE - - doesnt look as bad, but still is near the peak of the range and indicates a negative forecast.I totally get that timing is pretty impossible, but wouldnt you say theres SOME level that youd hold cash? Like, if forward P.E. was back to 35-40 levels? If TMCGDP ratio hit 200? Where do you draw the line?  <response>: I totally get that timing is pretty impossible, but wouldnt you say theres SOME level that youd hold cash? The only time I stop investing is if I see something scary on the horizon for my job or health layoffs during corporate buyout, as one example. Even then, I dont unplug anything already invested - I just pause contributing to investments and instead bolster the emergency fund.But thats it. Market timing is so impossibly difficult I dont mess with it at all. As long as I dont have any emergency coming up my strategy is simple: buy and buy more. I wish I could nail timing and single stocks like Buffett, but Ive just resigned myself to the fact that hes both better at finance than me and has waaayyy more resources to make decisions than I do. 