Background Introduction.- Incentive Mechanisms for Device-to-Device Communications in Cellular Networks with Adverse Selection.- Incentive Mechanism in Crowdsourcing with Moral Hazard.- Tournament Based Incentive Mechanism Designs for Mobile Crowdsourcing.- Multi-Dimensional Payment Plan in Fog Computing with Moral Hazard.- Financing Contract with Adverse Selection and Moral Hazard for Spectrum Trading in Cognitive Radio Networks.- Complementary Investment of Infrastructure and Service Providers in Wireless Network Virtualization.- Conclusion and Future Works.