There is far less empirical and statistical studies performed with regard to the service sector than the manufacturing sector. The productivity of the service sector has not been identified clearly in relation to the sectoral growth because the productivity of service sectors has not been improved for decades in major OECD countries. The growth of service sectors are important particularly from the viewpoint of small to medium-sized enterprises (SMEs), which consist a large part of the service sector even more than that of manufacturing sector. This book examines the importance of service sectors in regard to the growth of the entire economy