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  • David Orkin thinks this is interesting:

A trader who is right only 70 percent of the time will deplete his account in fairly short order


Cover of Vertical Option Spreads: A Study of the 1.8 Standard Deviation Inflection Point, + Website


This statement is absurdly inaccurate, as it does not matter how often a trader is "right" or "wrong" without understanding profitability of the trades, percentage of trades that profit is irrelevant.