Marguerite Louise's extravagances perturbed Ferdinando because the Tuscan exchequer was nearly bankrupt; it was so empty that when the Wars of Castro mercenaries were paid for, the state could no longer afford to pay interest on government bonds. Accordingly, the interest rate was lowered by 0.75%. The economy, too, was so decrepit that barter trade became prevalent in rural market places. In August 1663 Marguerite Louise delivered a boy: Ferdinando. Two more children followed: Anna Maria Luisa in 1667 and Gian Gastone in 1671.