The primer is an introduction to our full market outlook report. This report examines the current state of 5G, exploring its current level of maturity, looking in detail at the proposed 5G use cases, the economics of 5G, and the business opportunities from 5G. We look at what will drive 5G deployment in public networks and what are the real economic drivers for 5G. For 4G/LTE we believe the business case was easy: it was both much cheaper per unit capacity, and it delivered a vastly improved user experience, compared to 2G or 3G. The business case for 5G investments is difficult. 5G is undoubtedly technically better and more capable but its more expensive. CSPs can provide connectivity services, but that alone is not going to justify the required spectrum and capital infrastructure. 5G is an engineering led, technical vision of what CSPs can be in the future.