THE PRINCIPLE OF SUBSTITUTES AT WORK. What sleet or snow or gloom of night could not do, electronic mail and electronic funds transfer can do. There are fewer blue letter boxes for the couriers to call at on their appointed rounds.

If a box is earmarked for removal or relocation, a 30-day notice is posted on the box that informs users how to argue against the planned removal.

"For the vast majority of the 300 boxes that we've removed, we have had little or no response," [Milwaukee postal district manager David Martin] said.

You mean revealed preference works too?

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