ROAS- Return on Ad SpendROAS is the key performance indicator used by the Facebook Advertising world to determine how well campaigns are performing.
Any ROAS less than 1 is a considered to be poorly performing. 

ROAS (Unified)
This calculation includes online and offline purchases in order to determine how well campaigns are performing. A large portion of advertisers prefer using ROAS (Unified) because many business rely on in-store purchases. 

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