We know how many dollars banks create using the:

Under purely flexible exchange rates,

A) there is no intervention by the domestic fiscal or monetary authorities to specifically target the nominal exchange rate. B) there is only occasional intervention by the domestic fiscal or monetary authorities to specifically target the nominal exchange rate. C) the domestic fiscal and monetary authorities retain considerable flexibility to prevent short-run variability in the nominal exchange rate. D) the domestic fiscal and monetary authorities retain considerable flexibility to prevent long-run variability in the nominal exchange rate.

Slaves were

(a) unprofitable substitutes for wage labor on plantations. (b) profitable complements to capital equipment. (c) denied the use of shovels, hoes and axes. (d) all of the above.