Which of the following is true? All else equal, excess saving by oil-producing countries in the Middle East will result in an increase in the real interest rate in the U.S.,All else equal, when government spending and tax revenue DECREASE by the SAME amount in a closed economy, where the marginal propensity to consume is less that 1, then the equilibrium real interest rate will decrease, Public saving is a stock variable, None of the other answers is correct