To evaluate the options, Taylor creates a spreadsheet containing the key marketing metrics including estimated firm sales revenue and units, firm profit, and industry sales revenue. Based on industry research, he estimates that basic subscriptions would cannibalize standard sales at four times the rate at which premium subscriptions would. The goal of this activity is to understand the potential impact that a product line extension has on a firm's revenue, profit, and market share. Keep in mind that: Market share = Firm's sales revenue / Total industry sales revenue (including the firm's)