Not always a good strategy, if you invest during a bear market you may have to wait years before you recoup losses, of course as the old saying goes time in the market beats timing the market.
Time in the market applies to all the market, there's no qualifier for just a bull market - that would be timing the market. Vast majority of people cannot time the market.
This has merits in a bull market regime. However, we may not in a bull market: history suggests that we will have a deeper bottom within 3 - 12 months. So if you buy stock now, when the market is within 10% of it's peak, and you have to wait for two years for the market to recover to that peak, there's plenty of time for someone to wait for the trough and substantially outperform you. Hopefully you are at least collecting dividends, but 2% is a small solace for spending 30% more than you would need if you were patient for a few months.
The problem with timing the market is you have to be right twice - you have to choose when to sell and when to buy back in.
On the other hand, DCA'ing you way through a market decline and recovery will always leave you in a better position than one where the crash never happened.
The part about timing it perfectly is not true. You can time it, for example predict that the market will crash, shift your money to bonds now, the market goes up for another year and then dips below the level you exited at. At that point, you can shift back and you'd have made less money than someone who timed it perfectly but more money than someone who stayed.
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