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"Investors need to stick with what's working and not take unnecessary risks," Jim Cramer told viewers of his "Mad Money" TV show Monday.

Cramer identified three bull markets that are working right now: agriculture, gold and natural gas. He said the biggest factor contributing to their success is that the earnings estimates are just too low.

Agriculture is a twice-blessed sector, says Cramer, with growth being driven by both global famine and an increased demand for corn-based ethanol. He predicts corn and wheat are headed toward $16 a bushel.

Cramer has long liked the agriculture sector, especially such stocks as John Deere ( DE), Mosaic ( MOS), Monsanto ( MON) and Agrium ( AGU).

Now he believes the company best positioned to take advantage of this coming boom in commodity prices is Potash ( POT).

Cramer says Potash, which closed Monday at $157.36, about $11 off its 52-week high, is all about growth. The company is poised to grow 107% in 2008 and is expected to increase its potash production from 10.7 million tons to 15.7 million tons by year end.

And with the high cost of entry, Cramer expects little, if any, new competition to challenge Potash's dominance.

Potash reported a better-than-expected quarter in January and trades at only 22 times earnings. It also has a stock buyback program that Cramer finds attractive.

Cramer predicted Potash could trade as high as $383 a share.

Going with Gold

Cramer said he sees a bull market in gold, and taking a cue from Peter Marone, CEO of Yamana Gold ( AUY - Get Report), a stock which he owns for his charitable trust, Action Alerts PLUS, says the commodity could reach $1600 per ounce.

Since Cramer first recommended Yamana Gold back on June 6, 2006, gold has risen 56%, while Yamana has risen over 100%.

But Cramer now recommends Agnico-Eagle Mines ( AEM - Get Report) as the gold stock to own.

According to Cramer, Agnico is the second lowest cost producer of gold behind Yamana, and after interviewing the company's CEO last Friday, he says the company's story is just too good to pass up.

Cramer cited the American Stock Exchange's gold index as one measurement of how undervalued the gold stocks are. According to the index, the entire gold sector has only a $200 billion market cap, while a company like ExxonMobil ( XOM) is valued at more than $400 billion.

Cramer said the gold stocks as a whole should be valued at double their current levels.

"Very rarely do I mention a company two nights in a row," said Cramer, "But I believe so strongly in gold and Agnico that I just had to go more in-depth again tonight."

Strong Insider Buying

When oil gets too expensive and coal gets too dirty, Cramer says investors look towards natural gas. And that's why he predicts that natural gas is headed to $16. Cramer said he's returning to an old favorite as the best natural gas stock: Chesapeake Energy ( CHK - Get Report).

Chesapeake is the largest driller and producer of natural gas in the U.S., with over 15 trillion cubic feet in reserve. Cramer said he likes the company for its production growth and strong insider buying.

Cramer said Chesapeake is set to increase its production by 21% this year and is the most levered to the rising price of natural gas. He says both attributes make the company very attractive.

But Cramer said he's most impressed with the company's strong insider buying. He explained that there are dozens of reasons why a company's executives may sell stock, including estate planning, retirement and divorce. "But there is only one reason why executives buy stock in their own company," Cramer said, "and that's to make money."

Cramer cited Chesapeake's CEO, Aubrey McClendon, who just recently purchased 400,000 shares. McClendon, Cramer noted, has a proven track record of making money on his company's stock.

He highly recommended "piggy-backing" off of McClendon's moves, noting McClendon is a proven winner.

Following Pennsylvania's Lead

Cramer welcomed Pennsylvania Gov. Ed Rendell to discuss his state's handling of the subprime mortgage crisis. Rendell said his state's foreclosure activity is four to five times lower than some neighboring states.

The governor cited several things his state has done to help tackle the crisis early on. In 2003, the state has assigned 30 additional people to closely monitor the lending industry. The state also provided financial counseling to over 12,000 at-risk homeowners.

Rendell also noted two other state programs, including one to provide additional financial and mortgage education to students and adults. A second program allows the state to step in and purchase at-risk loans and refinance them at an affordable rate for homeowners.

Cramer commended Rendell for his insights and handling of the mortgage crisis. And he again advocated his idea for a national federal home loan assistance program that would be similar to the one Rendell has implemented for his state.

Lightning Round

In the Lightning Round, Cramer was bullish on Chesapeake Energy Corp ( CHK - Get Report), Freeport-McMoRan ( FCX), CVRD ( RIO), Mosaic ( MOS), Nucor ( NUE), Transocean ( RIG)and America Movil ( AMX).

Cramer was bearish on Linn Energy ( LINE), ALCOA ( AA - Get Report), USEC Inc ( USU), Gibraltar Industries ( ROCK - Get Report), Telefonica ( TEF - Get Report)and Google ( GOOG - Get Report).

Want more Cramer? Check out Jim's rules and commandments for investing by clicking here.

For more of Cramer's insights during the Lightning Round, click here .

At the time of publication, Cramer was long Yamana Gold and Freeport-McMoRan.

Jim Cramer, host of the CNBC television program "Mad Money," is a Markets Commentator for, Inc., and CNBC, and a director and co-founder of All opinions expressed by Mr. Cramer on "Mad Money" are his own and do not reflect the opinions of or its affiliates, or CNBC, NBC UNIVERSAL or their parent company or affiliates. Mr. Cramer's opinions are based upon information he considers to be reliable, but neither, nor CNBC, nor either of their affiliates and/or subsidiaries warrant its completeness or accuracy, and it should not be relied upon as such. Mr. Cramer's statements are based on his opinions at the time statements are made, and are subject to change without notice. No part of Mr. Cramer's compensation from CNBC or is related to the specific opinions expressed by him on "Mad Money."

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Some of the stocks mentioned by Mr. Cramer on "Mad Money" are held in Mr. Cramer's Action Alerts PLUS Portfolio. When that is the case, appropriate disclosure is made on the program and in the "Mad Money" recap available on The Action Alerts PLUS Portfolio contains all of Mr. Cramer's personal investments in publicly-traded equity securities only, and does not include any mutual fund holdings or other institutionally managed assets, private equity investments, or his holdings in, Inc. Since March 2005, the Action Alerts PLUS Portfolio has been held by a Trust, the realized profits from which have been pledged to charity. Mr. Cramer retains full investment discretion with respect to all securities contained in the Trust. Mr. Cramer is subject to certain trading restrictions, and must hold all securities in the Action Alerts PLUS Portfolio for at least one month, and is not permitted to buy or sell any security he has spoken about on television or on his radio program for five days following the broadcast.