Work on the chapter$-$ending case study on page $44,$ Uber: Everything on Demand, captures some of the recent changes in the foundations of e$-$commerce. Uber is at the forefront of the on$-$demand services business model that is being used in many different arenas, from transportation, to lodging, to personal services. The case illustrates many of the trends that have impacted, and will continue to impact, e$-$commerce, including the use of smartphones and tablets for purchasing goods and services, the growth of contract employment, and the disruption of traditional business models