Sixty is the average in defense industries, says military analyst Pavel Felgenhauer.

VOA: standard.2010.02.03

The good news is, for the average person in most industries, a Tumblr account is more luxury than necessity.

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Unemployment can be lower than average in such pet industries, while the unseen interference with employment elsewhere goes unacknowledged.

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In industries where average production costs fall as output increases, producing economies of scale, this means lower costs and prices.

ECONOMIST: A short tour of economic theory