In developed economies, the service sector now dominates the manufacturing sector, just as manufacturing prevailed over the agricultural sector after the industrial revolution. In this context the key business model is the transaction of services in return for money. People go to a hairdresser and receive a paid-for haircut service. Innovation consultants offer training courses to companies in return for a fee. Transportation services are offered per milage… The Service Sales model is the corner stone of our modern service economy.