Transcript text: Suppose a cigar manufacturer currently sells 1,500 cigars per week and makes a profit of $\$ 3,000$ per week. The plant foreman observes, "Although the last 500 cigars we produced and sold increased our revenue by $\$ 7,500$ and our costs by $\$ 7,000$, we are only making an overall profit of $\$ 3,000$ per week so I think we need to cut back on production.
Using marginal analysis terminology, what is another economic term for the incremental revenue received from the sale of the last 500 cigars?
A. sales revenue
B. gross profit
C. gross earnings
D. marginal revenue