Offer your thoughts or opinion on the input financial query or topic using your financial background.

Why don't some places require a credit card receipt signature, and some do?
My understanding it that the signature requirement is at the retailer's discretion. If the merchant decides to require a signature it protects them against fraudulent charge-back claims, but increases their administrative costs. In some situations it just isn't practical for a retailer to require a signature. Consider for example mail-order or online purchases, which I've never had to sign a credit card slip for.