“…Although the aggregate production function points to the determinants of long-term economic growth, namely the accumulation of capital and labor, and the introduction of technical change, it should be underlined that the critical variable, the so-called Solow residual, is not directly observable. Fortunately, in 1957 the Nobel laureate proposed the method to calculate it, that is to say, to discriminate the contributions to the economic growth of each of the arguments in the aggregate production function (Guerrero, 2009). To implement it, Solow (1957, p. 314) explained, in exemplary detail, every decision made.…”