Fewer than a majority of people in modern society can find happiness outside the sphere of private interpersonal relationships. People who realize that others could fill their occupational roles as ably as they do themselves cannot achieve any happiness in their lives. A majority of people in modern society do not appreciate having the jobs that they do have. Most people in modern society are happy in their private lives even if they are not happy in their jobs.
People are not happy unless they feel that they are needed by others. Most people in modern society, however, can achieve a feeling of indispensability only within the sphere of family and friendship, because almost everyone knows that his or her job could be done by any one of thousands of others.
The statements above most strongly support which one of the following?