【单选题】A theory asserts that manufacturers are less willing to sell units of output as the price of a good decreases, ceteris paribus. However, as the price of computers fell throughout the 1990s, more compu...
A.
The theory must be invaliD.
B.
The theory rests on assumptions that are too simplisti
C.
It is likely that variables other than the price and quantity of computers sold were changing.
D.
All variables other than the price and quantity of computers sold were unchange
【简答题】As the manufacturers cannot get all the quantity ready at the same time, it is necessary for the contract stipulations to be so worded as to allow ______ shipment .