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Cost Per Action (CPA)Cost Per Action (CPA) is a digital marketing pricing model where advertisers pay a designated fee only when a user completes a specified, measurable action. Unlike traditional advertising models where you pay for views or clicks, CPA directly ties advertising expenditure to verifiable conversions.Common Actions: Purchasing a product, signing up for a newsletter, filling out a lead form, downloading an app, or requesting a quote.Formula:$$\text{CPA} = \frac{\text{Total Cost of Campaign}}{\text{Total Number of Actions (Conversions)}}$$Strategic Value: CPA minimizes financial risk for advertisers because ad spend is directly tied to performance outcomes.