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Long ago (before 2000?) there was a link on these boards to a Friction calculator.
Entry items were something like: Cost per trade, trades per month, expected rate of return. It coughed up the Minimum Trade size to break even. Or something like that.

IIRC I was using Fidelity at $14/trade (not round trip) and the calculator came up with $4k per trade. Which is a useless figure (sorta) since I don't know what the entering arguments were.

I concur with other comments here regarding trade size. I suspect that trading less than $3-4k per stock/month means getting ground down by costs .. . even low costs. Unless it is 1999 and 1999. Which, in my case it was. So I got ground down by the market instead.

Good hunting !!

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