Today’s not actually Tax Day, at least not in practical terms, since a local holiday in DC has given filers until Monday to pay their dues to Uncle Sam. Still, it’s a good time to think about how the IRS would treat its “customers” if it relied on private-sector economics.  Wouldn’t this be better named Taxpayer Appreciation Day?  A girl can dream, and so Mary Katharine Ham does … and then wakes up: