Mengistae, Taye. Age-size effects in productive efficiency : a second test of the passive learning model / Taye Mengistae. - Oxford : Centre for the Study of African Economics, 1995. - 23 p. ; 30 cm. - Working paper series ; 96-2 . Includes Bibliographic references: (p. 19-21) Subjects--Topical Terms: Industrial efficiency-- Measurement. Industrial productivity-- Measurement. Dewey Class. No.: 338.5 MEN