Which best explains how the structure of the executive office of the president helps fulfil Presidency's office's role? A. The office is led by the chief of staff, who serves as a key adviser to the president.
B. The office has multiple levels of staff and advisers who help the president in many areas
C. The office is led by the vice president, who serves as a key adviser to the president
D. The office has a single level of staff and advisers who help the president in many areas​

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.