Day trading has been around for decades but has gotten a big boost recently. Back when brokerage companies charged commissions for each stock trade, trying to buy and sell the same stock multiple times a day could end up being extremely costly. Now that commissions have largely disappeared, though, day trading has become a seemingly more attractive and viable strategy to pursue.

Yet even without commissions to pay, there's another cost involved with day trading that can add up over time. Ultimately, it can threaten a day trader's ability to trade profitably.

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Source Fool.com