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Re:Uber discovered they’d been defrauded out of 2/3 of their... by benjam47 on Monday January 04, 2021 @02:27AM (#25628610)
Ratio can't be negative, but ROI can. Positive ROI is the percentage of the ratio being 1 or higher. Negative ROI is the percentage of the ratio being less than 1.

Or, from a "common sense" perspective, if I spent $1000 on advertising, and earned $100 in revenue from that investment, my ROI is definitely negative.

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