Profits depend on obtaining the maximum output
in terms of pounds of animals with the least expenditure
in terms of such factors as food and energy. Producers
have found that crowding animals into very small
spaces increases profits, until the point where
the crowding is so great that the number of animals
that die prematurely becomes too costly. This is
similar to the transportation of slaves: it was
considered "economical" to crowd slaves on the slave
ships, even though some died during the trip.
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