“50 is the New 25” (Dollars, that is)

Is 50 the new 25? I have no idea. But $50 sure seems to be the new $25 — threshold for signing a credit card receipt at checkout, that is. Except at Costco, where it’s now $100. I attribute the phenomenon to inflation, plus better credit card security (or at least, one would hope). P.S.: ...
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