data(gew)
Grunfeld, Y. (1958) The Determinants of Corporate Investment. Unpublished PhD Thesis (Chicago).
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).Here, $P_1 =$ Implicit price deflator of producers durable equipment (base 1947), $P_2 =$ Implicit price deflator of G.N.P. (base 1947), $P_3 =$ Depreciation expense deflator = ten years moving average of wholesale price index of metals and metal products (base 1947).
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,