The first caller on Jim Cramer's "RealMoney" radio show Wednesday asked him about whether to hold CB Richard Ellis Group ( CBG), the world's largest commercial real estate broker.

Cramer recommended avoiding any stocks connected with the real estate market or the building blocks for the real estate market.

"Even commercial real estate has to be slowed," he said, adding that the Federal Reserve wants to keep a lid on any potentially inflationary economic activity.

The next caller asked about United States Steel ( X - Get Report).

"The most difficult stock to own now is a steel stock," Cramer said. "When you own a steel stock, you want the economy to go full steam ahead."

But Cramer also believes that if the economy were to cool down, U.S. Steel's stock price would rise.

"That's because in the end we have learned our lesson that the Federal Reserve is in charge," he said, and he urged listeners to lighten up on their U.S. Steel positions until the economy cools.

The next caller asked about defense company General Dynamics ( GD - Get Report). Cramer is a fan despite the fact that the stock has been falling.

"Is the stock falling because of the fundamentals?" he asked. "No, it's because it's a stock," and all stocks are getting killed in this market, Cramer said.

The underlying fundamentals look good, and the company is in line to collect some "gigantic tank orders."

"If General Dynamics goes down, I'd buy more," he said.

The next caller asked about alternative fuel companies. Cramer said that such stocks were usually speculative, and that as a result, they may be disproportionately hurt by a general weakness in the market.

As a defensive move, he recommended that listeners lighten up on holdings of alternative fuel company Pacific Ethanol ( PEIX - Get Report).

Paychex ( PAYX - Get Report) and ADP ( ADP - Get Report) were two companies another caller asked about.

"These are precisely the companies that do well right now in the economic cycle," Cramer said.

"Why?" Because they specialize in running outsourced payrolls for other organizations. As a result, in the days just before paychecks are processed, these companies receive vast quantities of cash.

That cash can be lent out to the overnight money market, Cramer said.

When interest rates are low, that doesn't do a whole lot for earnings; but in a high-interest rate environment, like the current one, ADP and Paychex stand to have strong earnings.

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James J. Cramer is a director and co-founder of TheStreet.com. He contributes daily market commentary for TheStreet.com's sites and serves as an adviser to the company's CEO. Outside contributing columnists for TheStreet.com and RealMoney.com, including Cramer, may, from time to time, write about stocks in which they have a position. In such cases, appropriate disclosure is made. To see his personal portfolio and find out what trades Cramer will make before he makes them, sign up for Action Alerts PLUS. While he cannot provide personalized investment advice or recommendations, he invites you to send comments on his column by clicking here. Listen to Cramer's RealMoney Radio show on your computer; just click here. Watch Cramer on "Mad Money" at 6 p.m. ET weeknights on CNBC. Click here to order Cramer's latest book, "Real Money: Sane Investing in an Insane World," click here to get his second book, "You Got Screwed!" and click here to order Cramer's autobiography, "Confessions of a Street Addict."