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Three sectors according to Fourastié Clark's sector model This figure illustrates the percentages of a country's economy made up by different sector. The figure illustrates that countries with higher levels of socio-economic development tend to have less of their economy made up of primary and secondary sectors and more emphasis in tertiary sectors.
Allan George Barnard Fisher (26 October 1895 – 8 January 1976) was a New Zealand-born economist. Perhaps his most notable contribution was to investigate economic development in terms of the sequential dominance of different sectors of the economy: the primary, secondary and tertiary sectors ( three-sector theory ).
James E. Vance Jr. (1925–1999) was an American geographer known for his contributions in historical, urban and transportation geography. His approach developed emphasized studies related to transportation and settlement relationships as well as evolution of city systems.
Concepts and Techniques in Modern Geography were produced by the Study Group in Quantitative Methods of the Institute of British Geographers. [3] [5] Each CATMOG publication was written on an individual topic in geography rather than a series of broad topics like traditional textbooks and ranged between 40 and 70 pages.
Keith Charles Clarke (born December 9, 1955) is a professor of Analytical Cartography and Modelling in the Department of Geography at the University of California, Santa Barbara, USA. [ 1 ] He is a Fellow of the American Association for the Advancement of Science and his research area is cartography and geographic information science .
One of his classes to become a teacher was in geography. Having found his calling and his discipline, he sought study advice from Gilbert F. White at the University of Chicago. White gave him some key texts to read, Kates returned to discuss them, White recognized his abilities and steered him through an MA and eventually a PhD in Geography (1962).
Sometimes referred to as the Fisher–Orr model, Fisher's model addresses the problem of adaptation (and, to some extent, complexity), and continues to be a point of reference in contemporary research on the genetic and evolutionary consequences of pleiotropy. [3] The model has two forms, a geometric formalism, and a microscope analogy. A ...
Gordon Leslie Clark, [1] FBA FAcSS (born September 10, 1950) [4] is an Australian economic geographer, academic, and consultant.He is former Executive Director of the Smith School of Enterprise and the Environment, University of Oxford (2013-2018) [5] [6] with cross appointments in the Saïd Business School and the School of Geography and the Environment. [7]