Drag the correct words or phrases into the blanks to complete the following paragraph.

A monopolist follows the same profit-maximizing rule as a firm in a competitive market: produce until marginal cost equals marginal revenue. As prices go down, the monopolist gains more customers. At the same time, this lowers the revenue from each individual customer, including the existing ones. However, up to a certain point the increased sales volume offsets the revenue loss from the price decrease.
(Monopolists still have to follow the laws of the market and only have partial control over what prices they set.)