If you have a positive return on investment, it means that your campaigns are bringing in more money than you are spending on them. Demonstrating digital marketing ROI is important because without measuring this, you are essentially marketing blind.... allocating your marketing budget for the best results. However before calculating this KPI kindly do check your campaign ROAS (return on ad spend).
Since as a marketer this is your first line of defense.
Good-Luck (Team Expertek)
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