John Bates Clark,
Essentials of Economic Theory
“ The gradual introduction of an improvement is important, since it affords time for an increase in the social demand for the product which is thus cheapened and for introducing at many other points improvements which neutralize, in a large degree, the labor-expelling effect of the first improvement. (4) Technical gains are the largest source of additions to the total amount of the social capital. The constant influx of new capital facilitates the placing of laborers at the points where they are needed. ”
