One of the things I loved most about being a mailman was the chance to do a good turn daily. Customers always thanked you when you did something extra, which kept me looking for other chances to help my customers, except for the assholes. If you think your letter carrier isn’t keeping a list of who’s naughty and nice, you are not living in reality. And letter carriers talk. If you are mean to one of them, we’re all going to know. So saying thank you is in your enlightened self-interest. But it’s more than that, because while getting thanked feels good, saying it is vital. Transacting makes you
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