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Not sure you can time the market better than the Market times itself, certainly as it comes to etfs. So I'd keep your monthly etf contributions equal month on month.

Personally, I save a fixed amount for etfs, but try to move a symmetrically on shares (though not sure I'm successful)
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@Waldo to time the market, i' m gonna use the SMMA. When the SP500 is below SMMA, i'm gonna invest in risky ETFs.
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@Diogo241 on which period? 200 days? 14 days? 365 days?
the results will be everytime different. If this is long term, it won't matter, and I think it will just make you waste time in the market. There was somewhere a study with somebody doing backtest monte carlo simulations on lump sum vs all kinds of different strategies (buy only if there is a fall for more than x days, buy just a little and then only if there is a fall, etc) on the SP500. The results were almost always the same: the sooner you put a big sum of money to work, the better, if we talk about 30+ years. Market timing is achieved only by insiders or lucky traders.
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