00314nam a2200121Ia 4500082000900000100001800009245008200027260000900109300000600118500005800124500000500182700000500187  aSFb  aJohnsen, Leif  aRules of thum for the expansion of industries in process of economic growthb  c1960  a   a"Reprint from Econometrica, Vol.28, No.2, April 1960"  a  a