AUTOS

The California Public Utilities Commission postponed its much-awaited decision on the restructuring of the state’s $20-billion electric utility industry until Dec. 20. . . . The chairwoman of the Commodity Futures Trading Commission, Mary Schapiro, resigned to take a job as top regulator of the National Assn. of Securities Dealers Inc. . . . Real estate developer Donald J. Trump completed his purchase of 40 Wall Street, buying the 70-story office building across from the New York Stock Exchange for a price estimated to be below $8 million.