In 2000, McDonald's introduced its McSalad Shaker, which failed to catch on with the public and was subsequently dropped from the menu. This failure illustrates the idea of: downsloping demand. specialization. technological change. consumer sovereignty.

consumer sovereignty

Explanation:

Based on the information provided within the question it can be said that this scenario best illustrates the idea of consumer sovereignty. This is a concept that describes the how the wants and needs of the consumer population is able to control what products a company produces, because the company needs to produce products that the consumer population will buy.  Which is why the McSalad Shaker was dropped from the menu in this scenario.

answer; ///the above statement is (false) .

answer; engaging in effective public relations;