The Equation Underlying the Mainstream View of Macroeconomics Is
A) $M V = P Q$

The equation underlying the mainstream view of macroeconomics is

A) $M V = P Q$
B) $C _ { a } + I _ { g } + X _ { n } + G = \text { GDP. }$
C) $S = a - b Y$
D) $\mathrm { GDP } = P \times Q$