After the Industrial Revolution came on, it was no longer true, even in the roughly approximate way in which it might have been true some time earlier, that equality before the law, barring property rights, would mean equal opportunity. In the leading, aggressive industries which were beginning to set the pace for all that economic system that centered about the market, the unit of industrial equipment, as required by the new technological era, was larger than one man could compass by his own efforts with the free use of the commonplace knowledge of ways and means. And the growth of business enterprise progressively made the position of the small, old-fashioned producer more precarious. But the speculative theoreticians of that time still saw the phenomena of current economic life in the light of the handicraft traditions and of the preconceptions of natural rights associated with that system, and still looked to the ideal of "natural liberty" as the goal of economic development and the end of economic reform. They were ruled by the principles (habits of thought) which had arisen out of an earlier situation, so effectually as not to see that the rule of equal opportunity which they aimed to establish was already technologically obsolete.[6] During the hundred years and more of this ascendancy of the natural-rights theories in economic science, the growth of technological knowledge has unremittingly gone forward, and concomitantly the large-scale industry has grown great and progressively dominated the field. This large-scale industrial regime is what the socialists, and some others, call "capitalism." "Capitalism," as so used, is not a neat and rigid technical term, but it is definite enough to be useful for many purposes. On its technological side the characteristic trait of this capitalism is that the current pursuit of industry requires a larger unit of material equipment than one individual can compass by his own labor, and larger than one person can make use of alone.