economists have since used marginalism to dispute the Labour theory of Value. Historical development During the course of the eighteenth and nineteenth centuries, there was a gradual movement in Europe and in the states that Europeans had founded, for the reduction of trade barriers, in particular restrictions on production and labor, the use of non-standard weights and measures, restrictions on the formation of new businesses, and royal prerogatives that interfered with the conduct of commerce. Two parallel doctrines emerged to describe and justify this process. One was the legal doctrine that the rightful owner of land or exerciser of a property right was the one that could make the best economic use of it, and that this principle must be reflected in the property laws of each nation. The other was the political doctrine of laissez-faire economics, namely that all coercive government regulation of the market represents unjustified interference, and that economies would perform best with government only playing a defensive role in order to ensure the operation of free markets. The next major revision of the theoretical basis of capitalism began in the late 19th century with the expansion of corporations and finance, the globalization of production and markets, and the increasing desire to tap the productive capacity of the capital sectors of economies in order to secure the markets and resources required to continue economic growth. Many, particularly the wealthy, came to view the state as a vehicle for improving business conditions, securing markets, and gaining access to scarce materials—even when such objectives could only be achieved through military force. In the 1920s this philosophy found its most publicly prominent voice in President Calvin Coolidge's assertion that "the business of America is business". Critics of this period label it "corporatism", while its adherents generally regard it as a logical extension of the "laissez-faire" principles of natural liberty. Capitalism and imperialism J. A. Hobson, a British liberal writing at the time of the fierce debate concerning imperialism during the Second Boer War, observed the spectacle of the "Scramble for Africa" and emphasized changes in European social structures and attitudes as well as capital flow, though his emphasis on the latter seems to have been the most influential and provocative. His so-called accumulation theory, very influential in its day, suggested that capitalism suffered from under-consumption due to the rise of monopoly capitalism and the resultant concentration of wealth in fewer