Regularly + surcharges after a slump.

ETFs and everything else only on a one-off basis in a downturn. I only run DCA when a stock has fallen and I expect it could fall further - I stagger my purchase.

I only buy ETFs on a regular basis.

Only on a regular basis, otherwise I don't think it makes much sense. For me it's the easiest style of investing, DCA and ETFs.

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