Final answer:
Volume pricing would be the appropriate pricing strategy if a firm bases the selling price on an estimate of volume or quantity that it can sell in different markets at different prices.
Step-by-step explanation:
The pricing strategy that would be used if a firm bases the selling price on an estimate of volume or quantity that it can sell in different markets at different prices is Volume pricing. This strategy involves setting different prices based on the volume of products sold in different markets. For example, a company may offer a lower price per unit for larger quantities purchased.