The multiplier for the Australian economy is half the size of that for the Brazilian economy. Which of the following is a possible reason for the difference in the size of the multipliers? a. Brazil has a lower marginal tax rate than Australia. b. Brazil has a higher marginal tax rate than Australia. c. Brazil has a lower marginal propensity to save than Australia. d. Australia has a higher marginal propensity to consume than Brazil. e. Both a and c are correct