Short Reports

The Federal Trade Commission is reviewing a complaint by a traditional brokers’ group that advertising by Internet brokerages lures investors with unrealistic promises of quick riches and unfairly attacks full-service rivals.

Online retailer Amazon.com Inc. said it has agreed to acquire a 5 percent stake in Audible Inc. and offer the company’s spoken-word recordings through the Amazon Web site. Audible sells radio programs, speeches, and recorded readings of books and articles in formats downloadable over the Internet.