Professor Tabarrok suggests that monetary policy is both an art and a science because of the complexity of answering all of the following questions EXCEPT:

In calculating GDP, economists

A) measure total expenditure as the only true measure. B) can measure either total expenditure or total income. C) measure total income as the only true measure. D) measure total income minus total expenditure. E) measure total income plus total expenditure.

Exempting food purchases from sales tax is consistent with the ability-to-pay principle, although not necessarily consistent with vertical equity

Indicate whether the statement is true or false