For techniques diffusing as commodities, sales form a critical medium of technological communication which facilitates secondary invention. While sales may also influence the incentives to invent, I argue that the technical learning associated with selling provides a fuller account of invention for the case of the sewing machine in the United States. A study of some 3,500 patents and forty-eight city directories shows that as sales expanded in extent and location, so did patenting by first-time inventors. Moreover, patent use generated a flow of information back to inventors which increased the likelihood and extent of repeat patenting. In these ways, sales sustained technological change as a cumulative process.

The West Main Cree of northern Ontario adapted readily but selectively to the European technologies and institutions made available by the fur trade. Yet some basic cultural and psychological differences regarding the accumulation of wealth, attitudes to work, and dependence on relief and government transfers complicated Indian-European relations. In a rational attempt to compromise among today's complex choices, the Cree have abandoned their traditional bush pursuits for village life and wage employment, with hunting and trapping reduced to part-time or recreational activities.

European technology, both practical and managerial arts, had an impact on the well-established cotton and handicraft textile industries of the Western Sudan during the first twenty-five years of colonial rule. But French efforts to shape cotton production for export did not always have the intended results. Indigenous historical processes as well as French colonial policy account for the changes in these industries.

The introduction and diffusion of what Alfred Chandler called modern business enterprise had a profound capital-saving impact on the American economy. Given the availability of the railroad and telegraph, purchasing more managerial labor services paid off principally via increased speed of production and inventory turnover, which spread costs of holding capital over a larger volume of output. This article challenges the consensus that nineteenth- and early twentieth-century technological change in the United States was overwhelmingly labor saving and interprets the factor-saving bias of modern business enterprise as representative rather than anomalous.