David's Time With Peter F. Drucker 2020.4.3
And within the first decades of the 21st century there will be both changes in the trends and changes within the trend. Yet neither executives nor economists pay much attention to the distribution of the shares of disposable income. In fact, most are totally ignorant of them.
The four growth sectors during the 20th century were, respectively:
Government
Health Care
Education
Leisure
with Leisure probably taking as much of the enormous expansion of economic productivity and output as the other three together.
——《Management Challenges for the 21st Century · Chapter2》(Peter F.Drucker,1999)