Drucker suggested that another such transformation is taking place today. He claims it

　　began around 1960 with the introduction of computers and the emergence of the first nonwestern country—Japan—to be a global economic power. The period is predicted to end sometime around 2010 or 2020, when what Drucker calls the “post-capitalist” era will have produced the knowledge society. The major characteristic of this new society will be the use of knowledge as an economic resource. That is, knowledge, not labor, will be the basis of wealth. The leading social group will be “knowledge workers” who know how to make specialized knowledge productive and innovative in a free-market system. Drucker warns that this situation may create class conflict, as knowledge workers accrue much higher status and income than service workers. Recognizing that these two groups of workers are not social classes in the traditional sense, he nonetheless feels that people who provide various types of services—food, finance , leisure, and the like—must not be socially and economically disadvantaged. Otherwise, the old conflict outlined by Marx between capitalists and workers will be transformed into one between the two new dominant groups: those who create and work with knowledge and those who provide various services to them.

　　30. Those are the events which happened between 1455 and 1517 EXCEPT __________.

　　A. the Industrial Revolution

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