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Waste not, want not - a saying made for the lunar environment.
This kind of switch exists today, of course; they are cheap enough to pay for themselves in a year or so of use.
I don't know if this idea is original to Heinlein or not; commercial light switches for use in homes have been around since the 1890's, if not a bit earlier.
Heinlein continues his justification for such a device, proceeding along in a vein that seems to have some validity today.
"You can if the power continues to be rationed. There is a power shortage now; and there will be a bigger one."
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