Market timing is a fools game. You will never catch the top, or bottom, correctly. However, there are periods when a dip can be taken advantage of, if you have a time horizon longer than 6mo-1 year. For instance, does anyone think oil will remain at $40 in 3 years? What an opportunity to periodically buy into energy right now, as long as you don;t need the money before year end. Same thing for the current equity market dip. Next year is an election year and the market generally does well then, plus the economy is better now than it was a year ago. So this dip could be bought into for a return over the next year.
It is fun to try and predict the numbers though, even though it is more like putting a finger in the air than making a prediction based on any kind of fundamental facts.
Yes, you can never catch a bottom or a top correctly, but you can take advantage of dips longer term.
I had made some good money this year already in my retirement account, buying into dips (while never catching the top correctly of course), and then decided to leave the market because it seemed too stable for too long, and trading within a very narrow range for most of the year, making it vulnerable to even minor shocks, and in my view there were no longer term prospects at this point to expect further short-term growth (we just came out of a 'meh' earnings season). So I had sat out the first dip of 6 % during last week, but then went in. I hoped there would be a rebound on Monday, but took into account the possibility that the market might drop further anyway. I just wanted to make sure I had a good gain over the market come year's end.
Well, on Monday and Tuesday I dipped with the market 5 %. So I lost some money. Tough luck. No reason to panic, I thought, because I was in for the long term. And yes, the rebound came unexpectedly swift, and I might even have some gains this week, who'd have thought. But I'm in for the longer term anyway. I won't get out before having made serious money again, which means at least several %, with perhaps some losses along the way. At this point there really is no way to tell which direction the market might go. Another dip to 1875? Nah, on what grounds? I guess the panic on China is over-blown (while their economy may slow down, their stock market has no connection to the real economy), and the US still looks good, also with the newest numbers this week. How will the market react to an interest hike by the Fed? Who knows. So I'll stay in. The market might fly up swiftly again to previous levels, and I don't want to miss out if that happens. Yes, it might also stall, or it might drop, even severely. No way to tell at this point.
Should I have gone in this Monday or Tuesday instead of last Friday? Sure, but as pointed out you can never tell the bottom correctly. I was simply looking at my nice % point advantage over the market this year, a pure numbers game, and decided that it was good enough to get in again, for hopefully some good yield come year's end -- even if the market ends flat, I'll still have made some serious good money.