摘要：In a remarkably short 15-year
period, a few large firms have
come to dominate U.S. meat
slaughter. In 1977, the four largest
beef packers accounted for 25 percent
of the industry¡¯s output. By
1992, the four largest firms accounted
for 71 percent of output.
That shift is not only confined to
beef. Over the same period, the four
largest hog slaughtering firms
increased their share of industry
output from 36 to 54 percent.
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