Zambia's largest copper mine has brought prosperity to Solwesi, a rural region, where employment and both positive and negative externalities have sprung up. A classic case of a shift in the demand curve, leading to a movement along the supply curve - witness the 3-million-dollar truck. Productivity depends not only on technology, but also on having highly trained workers: Ring Catambe sends her children to high school, and those who seek work in the mine but lack the training cannot find work.
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