At a party, it's sometimes permissible for serving personnel to
a. smoke, provided they don't do so in view of the guests.
b. become part of the party if they know some of the guests.
c. take home any leftovers that remain.
d. sample the buffet items before the guests arrive.

Mankiw attributes – chapter 1 and his 10 principles – differences in living standards within a countryover time and across countries at a moment in time to: a. the presence or absence of inflation and unemployment.b. the allocation of resources between private markets and the public sector.c. those that have dealt successfully with the efficiency v. equality tradeoff and those that haven’t.d. differences in productivity.e. ones that think at the margin and respond to incentives and those that don’t.