The stock has dropped 13% over the past two days to around $70.50, taking some of the shine off a late July rally driven by the online travel service’s recent 26% surge in quarterly profit. Shares have more than doubled over the past year, bulking up the company’s market value to the point that TripAdvisor is now worth almost $4 billion more than Expedia Inc., its onetime parent. That rise is slowing because of TripAdvisor’s new metasearch layout, which makes it easier for travelers to see the prices that online booking services are offering on flights and hotels. TripAdvisor previously made money by referring traffic to the booking sites via popup ads. The new layout has reduced the number of clicks it sends, as well as the revenue it collects for referring traffic. TripAdvisor said it could eventually offset that self-inflicted shortfall by attracting more users and by convincing online travel agents to pay it higher fees for listings on its pages—a link that draws someone to spend several hundred dollars on a room, after all, is far more valuable to the agent that books it. TripAdvisor finished rolling out those changes in late May, prompting a sense of relief at an apparently swift transition. Not so fast, the travel website’s boss said Wednesday, warning he wasn’t seeing “a lot of positive stuff” in the current quarter. Get the full story at The Wall Street Journal Read also "Business model change hits TripAdvisor’s click-based revenue"