More than 55% of that $2.4 billion was spent in five U.S. cities: New York, Los Angeles, San Francisco, Miami, and Boston. Using data from hundreds of U.S. markets, CBRE Hotels, an advisory group that provides research and consulting services to the hotel industry, has developed an Airbnb Competition Index. That measurement compares Airbnb’s average daily room rate to that of hotels, the scale of active Airbnb inventory vs. the supply of traditional hotels, and the overall growth of Airbnb supply. New York was identified as the number one domestic market at risk for hotels, with an Airbnb Competition Index of 81.4 out of 100. That was followed by San Francisco, Miami, Oakland, and Oahu. R. Mark Woodworth, senior managing director of CBRE hotels, says the continued success of Airbnb could keep average daily hotel rates from rising as fast as they have. Get the full story at USA Today and CBRE Hotels