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Did I miss something? If dollar cost averaging produces better returns 2/3 of the time, and lump-sum investing produces better returns 1/3 of the time, then why is lump-sum a clear choice? (Especially since that study only examined 6 months' worth of DCA contributions.)

I have 34 years till retirement. If I were contributing $2000 to an IRA each year from now till then, I'd rather make 408 monthly contributions than 34 annual contributions. Over that period of time, doesn't dollar-cost averaging show a clear advantage? (leaving aside the cash flow question - let's assume I have $2000 ready to invest each January.)
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