Fill in the blanks:
a. When demand is elastic, an increase in price causes quantity demanded to______________ and total revenue to__________.
b. When demand is inelastic, a decrease in price causes quantity demanded to ____________and total revenue to__________.
c. When demand is unitary elastic, an increase in price causes quantity demanded to ______________and total revenue to_____________.
d. If price falls and total revenue falls, demand must be___________.
e. If price rises and total revenue stays the same, demand must be____________.
f. If price rises and total revenue rises, demand must be____________.