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NEW YORK ( TheStreet) -- When the richest men in the world are buying into the stock market, you should be, too, Jim Cramer told "Mad Money" viewers Tuesday. Cramer said while some analysts may be encouraging investors to sell, those in the know are signaling it's time to buy, buy, buy. Cramer said he's always been an advocate of buying on weakness, which is why he was telling investors to buy into Monday's big selloff. That was good advice again today, he said, because the market quickly snapped back and resumed rally mode. But more important than the markets are what the big boys are doing, said Cramer. Case in point: Larry Ellison, Michael Dell and John Malone. Cramer said that Ellison, founder of Oracle ( ORCL), saw huge value in the market when he opted to buy Acme Packet ( APKT), a terrific tech company whose stock has been down on its luck of late. Then there's Michael Dell, CEO of Dell ( DELL), who also saw value in his company -- so much so that he was able to whip up a $24.4 billion deal to take the company private. Finally, there's billionaire John Malone of Liberty Media ( LMCA), who is spending $12 billion to take a stake in Virgin Media ( VMED), giving his media empire huge exposure to the European market for a steal. Cramer said all three of these business titans are signaling that now's the time to take the plunge into this very inexpensive stock market. "Don't bother waiting," said Cramer. Deals like these are likely to continue.