The Austrian school of economics was founded in 1871 with the publication of Carl Menger's Principles of Economics. In his book, Menger argued that economic analysis is universally applicable and that the appropriate unit of analysis is man and his choices. These choices, he wrote, are determined by individual subjective preferences and the margin on which decisions are made. The logic of choice, he believed, is the essential building block to the development of a universally valid economic theory. The home of the field moved first to Britain and then on to the US, and at present a diverse mix of intellectual traditions in economic science is obvious in contemporary Austrian school economists. While one could argue that a unique Austrian school of economics operates within the economic profession today, one could also sensibly argue that the label `Austrian' no longer possesses any substantive meaning.