When selling the 100th widget, the firm will always receive A. less marginal revenue on the 100th widget than it received on the 99th widget.
A downward-sloping demand curve simply means that when there's a reduction in the price of a good, the consumers will purchase more of that product.
Based on the information given, when selling the 100th widget, the firm will always receive less marginal revenue on the 100th widget than it received on the 99th widget. The marginal revenue is the increase in revenue based on an additional unit of output that's sold.
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