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Zhang WD, S Zhang and XM Luo (2006). “Technological Progress, Inefficiency, and Productivity Growth in the US Securities Industry, 1980-2000.” J Business Research 59(5): 589-594.

Zhang WD, S Zhang and XM Luo (2006). “Technological Progress, Inefficiency, and Productivity Growth in the US Securities Industry, 1980-2000.” J Business Research 59(5): 589-594.

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