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Can I estimate other people's credit limit at the grocery store?
The minimum amount is set by the merchant services provider based on the kind of business, its location and the history. It mostly has nothing to do with you personally. However, the minimum amount differs based on the kind of credit cards being used. For example, foreign credit cards will require signatures on much lower amounts than domestic.  In my local Safeway (NoCal analog of Ralph's) the limit for domestic credit cards is set at $50. If your credit limit is $5000, you might think that its a 1% of your limit. But if your limit is $50000 or $500 - it will still be $50. You cannot deduce anything about a specific person's credit situation based on whether or not they are required to sign the receipt. It has no affect on the decision.