The same techniques that motivate people to install apps in general! iBeacons allow your mobile device to interact in great detail with the surrounding environment, so the promise of some form of reward is required -- better ability to find what you're looking for, or an improved experience. A lot depends on what the business is doing. In a restaurant, being able to automatically place an order when you walk in is compelling. In a store, automatically paying when you approach the cash register is compelling. In a museum, navigating the exhibits and diving deep into the ones that interest you is compelling.