Eric Hughes, a cryptology expert with Simple Access, an electronic-commerce consulting firm, conducted his own experiment: at a technical conference, he issued a roll of pennies to every participant and explained that there was a one-cent charge, payable into a box beside the door, each time anyone entered the main room.

ECONOMIST: So many ways to pay online

In other words, in the eyes of the law, it would not be fair or reasonable to increase the amount of monetary damages payable by a breaching party by having it be responsible for losses of the aggrieved party that are reasonably avoidable.

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Being able to tell a receivable from a payable does matter.

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