Some big steel makers have tried to see off the threat by running their own mini-mills.
ECONOMIST: In America��s fiery furnace
The big, integrated steel makers pooh-poohed the tiny mini-mills when they started up in the 1970s.
ECONOMIST: OPINION
Mini-mills have been doing well: their share of the market has quintupled over the past 25 years.
ECONOMIST: Why protecting American steel is such a rotten idea
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