Return on investment it’s an important metric for your business that tells you how much you’ve gained (positive ROI) or lost (negative ROI) compared to the amount of money invested. ROI is usually displayed as a percentage or a ratio, and you calculate it by dividing the gain/net benefits earned by the cost you paid.
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More on return on investment on the Piwik PRO blog:4 steps to optimize visitor engagement with your website using the content efficiency report