Friedmann’s Core-Periphery Model

Core-Periphery Model is a spatial model of economic development based on observation that development is rarely evenly distributed, be it at a regional, national or international scale.
Myrdal’s Cumulative Causation Model

Myrdal in 1956 argued that regional differences are the natural outcome of economic development and the inevitable result of market forces. No one region can prosper, he said, without adversely affecting the prosperity of another.
आलेखी मापनी बनाने के सामान्य नियम (General Principles of Constructing a Graphical Scale)

इस लेख में हम मापनी को व्यक्त करने की आलेखी विधि में मापनी की रचना करते समय किन बातों का ध्यान रखना चाहिए ,की चर्चा करेंगे।