【单选题】If the bundle x is revealed (directly or indirectly) as preferred to the bundle y and x 1 y, then it is never the case that the y is revealed (directly or indirectly) as preferred to x; so the necessa...
【简答题】Changes in the social structure may indirectly _____ juvenile crime rates. For example, changes in the economy that lead to fewer job opportunities for youth and rising unemployment in general make ga...