Final answer:
The student's question pertains to the concept of demand elasticity, where quantity demanded is insensitive to price changes. This scenario is indicative of an inelastic demand situation, where percentage changes in quantity are minor despite changes in price.
Step-by-step explanation:
The concept in question relates to the elasticity of demand in economics, particularly when the quantity demanded does not respond significantly to a change in price. At the upper end of a demand curve, a small change in the quantity demanded represents a large percentage difference because the initial amount of quantity demanded is low. However, a change in price of, say, a dollar, impacts the percentage much less at the upper end than it would at the bottom of the demand curve. Conversely, at the bottom of the curve where the quantity demanded is high, even a large change in the number of units sold will represent only a small percentage change.