The line between trading and investing may have blurred, Cramer said Friday, especially after the crash of 2008.

He used to define investing as a long-term buying strategy, one where a stock was bought with an 18-month time horizon in mind. Trading, on the other hand, was a near-term approach used to capitalize on market fluctuations. But now Cramer is recommending some combination of both, because those short-term price moves could be the best way to recoup your losses from the crash and get back to even.