U.S. Steel Stock Drops as Analyst Says the Good Times Are Ending.

Steel prices have been on an epic tear, boosting stocks of companies that produce the metal. Wall Street, however, is starting to worry about falling prices. Stocks related to a commodity always have a tough time when prices for that product weaken.

Monday, Morgan Stanley analyst Carlos De Alba downgraded United States Steel (ticker: X) stock to the equivalent of Sell from Hold. He cut his target price by more than 50% to $17 a share from $35.