The home-rental company has maintained a steady profit before interest, taxes and amortization for at least 17 months, said the people, who asked not to be identified discussing the private company’s earnings. In the quarter that ended in September, Airbnb pulled in about $1 billion, up from $500 million in the same period last year, one of the people said. Morgan Stanley raised concerns about Airbnb’s growth last week. A report from the firm said the frequency of bookings slowed, based on an online survey of 4,000 customers from the U.S., U.K., France and Germany. In addition to expanding globally, the San Francisco-based company is experimenting with new product categories like luxury accommodations, Airbnb-branded apartment buildings and guided tours. Get the full story at Bloomberg