Suppose you are a merchant and you decide to use a biometric

Suppose you are a merchant and you decide to use a biometric fingerprint device to authenticate people who make credit card purchases at your store. You can choose between two different systems: System A has a fraud rate of 1% and an insult rate of 5%, whereas System B has a fraud rate of 5% and an insult rate of 1%. Which system would you choose and why?

Solution

To me, fraud is a bigger problem than insult, so I would choose A, which has lower fraud rate at the cost of higher false rejection rates.