Only when AIM and Buy/Hold are both 100% invested does the upside capture ratio become equal
Under Portfolio AIM, in concept you could have just two stocks in that portfolio, both from similar sectors but one defensive (low beta maybe 0.5), the other aggressive (high beta maybe 1.5).
Perhaps switching to the low beta holding during declines (during sequential AIM buys) and then swap out into the high beta stock once AIM buying had flattened out (or selling had started) could yield low downside beta - maybe 0.5, and 1.5 upside beta.
Which also brings to mind whether AIM'ing an AIM might provide something along those lines :)
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