TOEFL Reading: ETS-TOEFL阅读机经 - F86E04SAW7F4S9Y1L$

According to economic theory, workers are more likely to change jobs when the associated costs are low. A. Since job changes by a minority of workers can radically alter overall job mobility rates, job mobility rates tell us little about the mobility costs facing the average worker B. Presidential location and individual psychic factors could account for some differences in job mobility among workers C. Economists argue strongly for job mobility despite the social and economic costs associated with it. D. Outside of the United States, subsidized housing and controls on rent increases explain why there is less job mobility in urban areas than in nonmetropolitan areas. E. Possibly due to housing and other differences, mobility costs may be lower in the United States than in most other developing nations which could help account for differences in job mobility. F. High job mobility arguably has both benefits, in terms of individual well-being and economic flexibility, and economic costs.