The Acceptance Ratio is the number of successful transactions divided by the number of transactions attempted. For example, if the Acceptance Ratio is 75%, on average, you had 3 successful transactions for every 4 attempts.
The Unique Acceptance Ratio measures unique users rather than attempts. If a user attempts a transaction several times after his transaction is declined, the Acceptance Ratio will include all attempts while the Unique Acceptance Ratio will include only one.
The Unique Acceptance Ratio is always higher than the Acceptance Ratio and is a better indicator to compare the performance between acquirers.
Typically the more attempts users make to purchase, the more money the merchant will earn. The Acceptance Ratio goes down but the Unique Acceptance Ratio goes up.
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