Here's a first, at least a first for me—but then, I don’t get out much.  Took a lamp in to be repaired, the guy asked for my email address, typed it into a laptop, said he'd email my receipt. 

I asked if any customers didn't want to give out their addresses.  He said maybe one in a hundred doesn't have email, usually old folks.  But few hesitate to furnish addresses-- "for those of course I give paper receipts."

Says the system "saves me about 2% a month."  Two percent of what it only just occurred to me to wonder.

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