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ROI (Return on Investment)
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CTR (Click-Through Rate)
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CTC (Click to Conversion Rate)
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CTB (Click to Buy Rate)
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CPM (Cost Per Mille/Thousand Impressions)
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CPC (Cost Per Click)
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CPA (Cost Per Acquisition)
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CPS (Cost Per Sale)
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APV (Average Purchase Value)
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APC (Average Per Click)