Dividend yields of 4 percent have been serving as a de facto floor for many stocks that have disappointed, “ Mad Money ” host Jim Cramer said Friday.

Stocks as varied as Freeport McMoRan, Walgreen, Procter & Gamble, Eaton and Nucor, he noted, “have all held or at least been stopped from going down at that level.”

“Four percent seems to be the level where, especially after taxes, you get a considerable benefit over bonds, and I have to believe that (Federal Reserve Chairman) Ben Bernanke knows that and embraces it,” Cramer said.

As an example, Cramer examined Freeport, a company that is subject to cyclical fluctuations.

“This company’s a copper and gold miner. Its stock should be back in the mid-20s by now — that’s how hated copper and gold have become — and even though both commodities are nowhere near as low as they were in 2008, the market has such conviction in their potential declines that you’d expect this stock to be at a much lower level by now,” he said. “Yet every time Freeport McMoRan gets to $32, where it yields 3.9 percent, it stops. Idle? I don’t think so. There’s just tremendous demand when it gets down there.”

Procter & Gamble, which reported disappointing figures Wednesday, was also saved by this level.

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