What key performance indicator (KPI) *directlyreflects the efficiency of your budget spend concerning acquired customers on Mail.ru advertising?

The key performance indicator (KPI) that *directlyreflects the efficiency of your budget spend concerning acquired customers on Mail.ru advertising is Cost Per Acquisition (CPA). CPA measures the average cost you pay for each new customer you acquire through your advertising campaigns. It's calculated by dividing your total ad spend by the number of conversions (acquisitions) achieved during a specific period. A lower CPA indicates greater efficiency, as you're spending less money to acquire each new customer. A higher CPA suggests that your campaigns are less efficient, and you may need to optimize your targeting, ad creatives, or bidding strategies to reduce the cost per customer. Other KPIs, such as click-through rate (CTR) or cost per click (CPC), are important indicators of ad engagement and cost, but CPA directly ties your ad spend to the outcome of acquiring new customers, making it the most relevant KPI for measuring budget efficiency in customer acquisition.