As a percent of GDP, the total U.S. federal debt has been declining since World War II

Which of the following algebraic forms of a demand curve yields an isoelastic demand curve (i.e. a demand with constant elasticity)?

A. Q = a - bP + cI B. log(Q) = a - b log(P) + c log(I) C. Q = a - b log(P) + c log(I) D. log(Q) = bP + cI

Which of the following has led to reduced use of ATMs?

A) some banks closing branches in low-income neighborhoods B) some banks charging fees for transactions performed by tellers that could be done by ATMs C) increased use of debit card transactions D) reductions in fees for overdrafts