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Revenue is the income generated from normal business operations and includes discounts and deductions for returned merchandise. Historical revenue is the revenue that has been actually realized by the company. [1]
[1] Retrieved May 21, 2021, from https://www.investopedia.com/terms/r/revenue.asp
[2] Marketplace KPI Dashboard, https://versionone.vc/marketplace-kpi/
[3] Retrieved May 21, 2021, from https://www.investopedia.com/ask/answers/09/how-companies-calculate-revenue.asp