“Industrial progress would undoubtedly be slower under state-control, because the very object of such control is to divert a larger proportion of human genius and effort from these occupations in order to apply them in producing higher forms of wealth. It is not, however, right to assume that progress in the industrial arts would cease under state-industry; such progress would be slower, and would itself partake of a routine character—a slow, continuous adjustment of the mechanism of production and distribution to the slowly-changing needs of the community.”