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With oil prices plummeting and bank stocks on the move to the upside, Jim Cramer asked the viewers of his "Mad Money" TV show, "how did the whole world turn upside down?"

Cramer said some good things are happening in the markets, and investors need to change their strategies to capitalize on them.

According to Cramer, three forces are driving the market higher. First is oil's inability to breach the $150-a-barrel level. Cramer said he's always believed that the rise in oil was due to supply and demand and not speculation.

He said oil is "just too high" at $150 a barrel. He said consumers are finally starting to cut their usage, leading to the decline in oil prices. He predicted oil could fall as far at $110 a barrel before stabilizing.

The second force driving the market is the financials. He said it's now clear that both the Federal Reserve and Securities and Exchange Commission are stepping in to bail out the sector.

With stocks like

JP Morgan Chase

(JPM) - Get Report

and

Comerica

(CMA) - Get Report

both reporting good results, Cramer said there may be life in the financials after all. He explained that the banks can use this strength in their stocks to raise capital and stay in business.

Finally, Cramer said the home-build rate of single-family homes is finally slowing, allowing excess supplies to dry up and prices to stabilize. Cramer predicted the bottom in home prices should occur in 2009.

Cramer: Oil's Headed to $110

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Cramer said for the short term, investors should take profits on the banking stocks, which have moved up too much. He also suggested buying oil and gas stocks because they have gone too low.

Cramer owned up to telling viewers to begin buying the oil stocks last week by saying he was wrong. However, he said investors who bought last week will be OK for the long term.

Sell Block

Cramer added nursing homes, or senior living communities, to his sell-block list, calling them "serial destroyers of value."

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He singled out both

Brookdale Senior Living

(BKD) - Get Report

and

Sunrise Senior Living

( SRZ) as two of the worst offenders.

Brookdale's stock has fallen from $48 a share to $17 a share, while Sunrise has fallen from $41 a share to just $19 a share. Cramer said the stocks could rally from here and he wants to avoid investors thinking this is the bottom.

Cramer said that most investors see senior living as a play on demographics. Although it's true the number of Americans 75 years and older will increased by 20% in the next 10 years, he said it's a mistake to own shares of these nursing homes.

He said nursing homes have made the same mistakes as homebuilders, building far too much capacity for now declining demand.

According to Cramer, the occupancy rates at nursing homes are flat to down, as people postpone retirement to recoup losses in the markets.

Furthermore, many retirees must sell their homes in order to move into these facilities and find they now can't. Yet between 2004 and 2008, Brookdale increased capacity at their facilities by 50%, while Sunrise increased its capacity by 25%.

"Housing is housing," said Cramer, as he reiterated his sell recommendation on the whole industry.

A Speculative Healthcare Play

Cramer moved "Speculation Friday" to Thursday in order to talk about

Symmetry Medical

(SMA)

, a stock that he said has been on his radar for awhile.

With the economy looking more like it's in a recession, Cramer said it's the healthcare stocks that will prosper.

Symmetry is a supplier of orthopedic implants to many of Cramer's larger healthcare favorites, including

CR Bard

(BCR)

and

Smith & Nephew

(SNN) - Get Report

, which is up 5.8% since Cramer's recommendation just last week.

"Nobody stops getting hip replacements because the economy is bad," said Cramer, who called Symmetry's products necessities and not discretionary spending.

Cramer said that bigger healthcare companies come to Symmetry to help speed up production and lower costs. He also noted that the company is not affected by rising raw costs since its main commodity is titanium. "Think of Symmetry as the arms dealer to the medical sector," said Cramer.

Symmetry makes Cramer's speculative list because of its run-in with the SEC earlier this year, which led to earnings restatements and a $2.2 million hit for accounting and legal costs.

But with the situation now behind them, Cramer called Symmetry a tarnished stock but not a tarnished company.

Wall Street is expecting 8.5% revenue growth for Symmetry in 2008, but Cramer said that number could be almost double. He sees the $16 stock reaching $21 a share if that happens.

Nothing Has Changed

Cramer said steel stocks have been crushed in recent weeks, with favorite

Nucor

(NUE) - Get Report

falling 11% after it lowered earnings guidance from $1.95 per share in the third quarter to between $1.80 to $1.85.

To find out if the drop was warranted, Cramer talked with Nucor CEO Dan Dimicco.

Dimicco said that his business has not dropped 20%, as the company's stock price would indicate. He said business is still strong and he also expects the third quarter to be strong. He called Nucor's guidance conservative.

Dimicco explained that Nucor's philosophy has always been to make money making steel. The company has great technology, great people and a great culture, he said. After delivering a second quarter that saw earnings up 68%, Nucor is firing on all cylinders, he said.

Cramer said that while the markets have been punishing steel, he's a buyer of Nucor.

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Lightning Round

Cramer was bullish on

Ferrellgas Partners

(FGP) - Get Report

,

Energy Conversion Devices

( ENER),

AT&T

(T) - Get Report

,

MetLife

(MET) - Get Report

and

Marathon Oil

(MRO) - Get Report

.

He was was bearish on

Sonic Corp

(SONC)

.

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 not long on any stock.

Jim Cramer, host of the CNBC television program "Mad Money," is a Markets Commentator for TheStreet.com, Inc., and CNBC, and a director and co-founder of TheStreet.com. All opinions expressed by Mr. Cramer on "Mad Money" are his own and do not reflect the opinions of TheStreet.com 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 TheStreet.com, 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 TheStreet.com 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 TheStreet.com. 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 TheStreet.com, 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.