“…48 In fact, in the 195o's and particularly between 1956 and 1961, a substantial part of the most "difficult" lSI was completed and the problems that emerged derived more from the difficulty of "digesting" the results of this lSI than from the limitations on the extent of lSI. Naturally, this 48 This is not the case with O'Donnell in his "Reftexiones" article, as his comments on p. 13 demonstrate, although he may have underestimated the extent of deepening which was already achieved before 1964. In an earlier work this underestimation is clearer, for example when O'Donnell asserts that: "What happened in the Argentine and Brazilian economies came to be known as the 'exhaustion' of the 'easy' stages of industrialization-i.e., the end of the period of extensive, horizontal industrial growth based on the substitution of imports of did not mean that the country had achieved some form of quasi self-sufficiency in the manufacture of producers' goods.…”