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This show last aired on May 2. NEW YORK ( TheStreet) -- "Investing isn't easy, but it doesn't have to be mystifying," Jim Cramer told "Mad Money" viewers Friday. He dedicated the entire show to helping translate Wall Street gibberish into plain English for individual investors. "Secular" and "cyclical" are two important ideas that go hand in hand. Cramer explained that cyclical companies need a strong economy to grow. Think steel, machinery and chemical stocks. Secular growers, on the other hand, keep growing regardless of the economy. Cramer said these are companies that make anything you eat, drink, smoke, brush your teeth with, or use as medication. Why are these distinctions important? Cramer said it's because they help determine how much a company will earn in a given environment. He said the hedge fund playbook was written on buying and selling these powerful trends. This is why the philosophy of buy and hold is silly, he said. Why would anyone want to hold onto a stock that's out of favor? During times of recession investors need to sell the cyclicals and buy into the secular names. When the economy is recovering, it's time to sell the seculars and jump back into the high-growth cyclicals.