Suppose the demand for wheat increased only slightly between 1950 and 2000 but the equilibrium quantity increased dramatically. Absent any other changes, what could explain the large increase in the equilibrium quantity?
The equilibrium quantity of wheat could have increased dramatically given a slight increase in demand because

The equilibrium quantity of wheat could have increased dramatically given a slight increase in demand because of 50 years of slight increases which also encountered a dramatic increase in supply and population.

Explanation:

Equilibrium quantity is the quantity at which quantity demanded is equal to quantity supplied.  It is the quantity found at the intersection of the demand curve and the supply curve, when shown graphically.

Another change that could result to a large increase in the equilibrium quantity is the increase in population of both demanders and suppliers which only grows slightly over the years, but results to a dramatic increase when compared from a reference point to another.

i think that it would be tenth of the first