DWD20200402

David's Time With Peter F. Drucker 2020.4.2 Shares in disposable income are the foundation of all economic information. In the first place, of all the outside information needed by a business, it is usually the most easily obtainable. It is usually also the most reliable foundation for strategy For as a rule, trends in the distribution of disposable income that go to a certain product category or service category tend, once established, to presist for long persist for long periods of time. They are usually impervious even to the business cycle. But for that reason, there are few more important changes for an institution than a change in the trend. And equally important is a change within the trend, that is, a switch from one kind of product or service within a category to another product or service within the same category. ——《Management Challenges for the 21st Century · Chapter2》(Peter F.Drucker,1999)