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NEW YORK (TheStreet) -- When everyone is bearish, it's time to change your thinking, Jim Cramer told his Mad Money viewers Monday after a strong showing on Wall Street. Cramer said when the facts change, investors need to change their minds. This week the tide is turning in a few key areas.

First is the Federal Reserve, which most certainly won't be raising interest rates after Friday's terrible employment number. Then there's oil, which has rallied 3.9% over the past week, as falling production here at home may finally be stabilizing prices.

Next, there's the strength in Wynn Resorts (WYNN) - Get Free Report and Las Vegas Sands (LVS) - Get Free Report , thanks to a loosening of restrictions in China's Macau region.

Cramer also noted individual stocks like DuPont (DD) - Get Free Report , which rallied on talk of a breakup, and some of the automakers, which are heading higher from either a stronger China or the collapse of Volkswagen (VLKAY) .

The markets don't go from bear to bull overnight, Cramer concluded, but it does appear that the facts are changing.

Super Cycle

The next time you hear an industry "expert" calling for a commodity "super cycle," run, don't walk, for the exits.

Cramer said just about every time you hear the term "super cycle" used, the commodity in question will inevitably be closer to a top than a bottom. It happened with ethanol, it happened with coal and now it's happening with fracking sand, that special sand used by oil drillers to keep wells flowing.

After topping out in October 2014, the stocks of fracking sand providers like U.S. Silica (SLCA) - Get Free Report have been in free fall as the entire industry ramped up big to meet the fracking boom, then was too slow in ramping back down as the price of oil collapsed.

That combination always leads to a massive oversupply and falling stocks, Cramer noted, which is why shares of U.S. Silica are down 77% over the past year.

Investors looking for an oil stock that is investable should consider Schlumberger (SLB) - Get Free Report , Cramer said. That stock has likely found its bottom.

Invest in Petlz

With activist investor Nelson Peltz announcing that he's acquired a $2.5 billion stake in General Electric (GE) - Get Free Report , is it time for investors to give this lagging industrial giant a second look? Cramer said even with shares up 5.3% on the day, he's still a huge fan.

Cramer said the GE restructuring may be getting yawns on Wall Street, but the plan, which includes buying back nearly 40% of the company, will be a huge boost to the company's earnings per share. He sees shares easily breaching $30 a share and beyond, especially given that the stock now has Peltz as a catalyst.

Give Mallinckrodt a Miss

What the heck is going on with Mallinckrodt (MNK) - Get Free Report , the pharmaceutical rollup company that saw its shares double after Cramer spoke with the CEO in August 2014 but now have fallen 54% from those highs?

Cramer said that all of the rollup companies, those that borrow money to buy new businesses, have been under pressure, but Mallinckrodt is getting hit even harder because the company's acquisition of Questcor Pharmaceuticals is proving to be more trouble than it's worth, just as many critics had predicted.

Mallinckrodt had a bullish following after the company was originally spun off, but Cramer noted the 2007 decision to raise the price of Questcor's main drug from $1,650 a vile to $23,000 is proving to be a disaster in an environment where drug pricing is coming under increased scrutiny.

Making matters worse, in the middle of its now high-profile litigation Mallinckrodt's general counsel has resigned, adding to the uncertainty.

With shares down 38% so far this year, Cramer said investors would be wise to continue to steer clear of Mallinckrodt for the foreseeable future.

Lightning Round

In the Lightning Round, Cramer was bullish on United Continental Holdings (UAL) - Get Free Report , Twitter (TWTR) - Get Free Report , Intrexon (XON) - Get Free Report , Skyworks Solutions (SWKS) - Get Free Report , Celgene (CELG) - Get Free Report and International Paper (IP) - Get Free Report .

Cramer was bearish on Sprint (S) - Get Free Report , Sierra Wireless (SWIR) - Get Free Report , AMAG Pharmaceuticals (AMAG) - Get Free Report , Motorola Solutions (MSI) - Get Free Report and Gogo (GOGO) - Get Free Report .

Executive Decision: Michael Weiss

For his "Executive Decision" segment, Cramer sat down with Michael Weiss, chairman, president and CEO of TG Therapeutics (TGTX) - Get Free Report , a stock that's down 36% from its highs in March along with the rest of drug sector.

Weiss said his company hopes to have results from the latest clinical trials for its blood cancer treatments within the next six to 12 months. He said the goal is to prolong the lives of patients suffering from these chronic conditions as the company works towards a cure.

On the current debate regarding drug pricing, he said politicians tend to lump all drugs together. In reality, there are innovative drugs that patients are willing to pay anything for, and then there are generics that everyone expects to be affordable.

He said drug companies have a social contract with patients where biotechs expect to be able to recoup their costs for innovation but then make drugs affordable when they go generic. Any change to that model could be a death spiral for the industry, he concluded.

To watch replays of Cramer's video segments, visit the Mad Money page on CNBC.

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At the time of publication, Cramer's Action Alerts PLUS had a position in TWTR.