  Proper incentive mechanisms are critical for mobile crowdsensing systems to
motivate people to actively and persistently participate. This article provides
an exposition of design principles of six incentive mechanisms, drawing special
attention to the sustainability issue. We cover three primary classes of
incentive mechanisms: auctions, lotteries, and trust and reputation systems, as
well as three other frameworks of promising potential: bargaining games,
contract theory, and market-driven mechanisms.
