<p>Crude oil is breaking to a new session low. The price just traded to $77.53. That's down $3.29 on the day.</p><p>In the process, the prices were falling below its 200-day mov
<p>This is a common question that new traders ask, but there isn't one simple answer. In this post, I'll break down how to figure out exactly how long you should test a trading system.
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