Customers substituting the firm's product for a competitor's product is

A) market growth.
B) stealing share.
C) forward selling.
D) forward buying.

Stealing Share

Refers to marketing strategies aimed at winning customers from competitors, thus increasing one's market share at the expense of others.

Market Growth

The increase in demand or sales opportunities in a given market over time, often measured by the percentage increase in market size.

Forward Selling

The practice of selling goods or securing orders for a product before it is available or ready to be shipped.