When you get to the till at the end of your supermarket trip, the price of your shopping is spirited from your ledger to the retailer’s.

You may do this online, of course, but the same rules apply, and in this way our families are fed and the rich world keeps spinning.

I am not required to disclose these transactions to anyone other than my wife (who expresses no interest anyway) while the supermarket does not have to disclose them either, for ...

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