Another rule that has led Cramer to become a better investor is to set a bottom line to purchase stock.
"What's this rule? Simple: never buy any stock above your cost basis, or the average price you've paid to build up your current position, unless something truly transformative has happened at the company."
In other words, if you determine $25 is your buy price, and you scale into a full position at an average price of $25, but then your stock subsequently rallies to $30, don't increase the size of your position at $30, even if you think there's more upside ahead.
There is however, an exception to Cramer's cost basis rule. "It's okay to pay a higher price for a stock if something's changed at the company that makes you believe the stock could increase dramatically."
However if the stock is simply rallying with the rest of the market without a specific catalyst, then Cramer's rule remains solidly in effect.
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Sometimes even a sell strategy is so obvious, Cramer can almost see you rolling your eyes, right through the TV.
After sifting through his own results and finding he wasn't always following this simple strategy himself, Cramer felt it had to be put into words, no matter what facial expressions may follow.
"The rule is very simple," Cramer said. "If you own a stock and it refuses to go higher when the market rallies over several days, you should probably sell it."
The rule seems so obvious, Cramer almost feels sheepish repeating it. But, it's a rule that could boost your bottom line significantly, and because it can do that, Cramer would shout it from the rooftops if necessary.
"For example, when PC stocks started to falter on big up days in 2008, it was an early sign that the space was facing something greater than a cyclical downswing," Cramer explained.
And even though some of these stocks had generated enormous gains, the strategic move was to sell.
"Ultimately the price action was a sign that smartphones were about to make PC's far less relevant," Cramer explained. Investors didn't know that at the time; but the lack of an advance on big up days telegraphed that something wasn't right.
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