Gravity Model: Predicts interactions between places, Larger & closer places will have more interaction, Larger places attract more migration, Central Place Theory: Predicts the location and distribution of cities, Identifies most profitable location for services , Threshold and range , Bid Rent Theory: Land value is determined by proximity to CBD/Market, Land value determines density patterns , Highest value land located near CBD, Weber's Least Cost Theory: Predicts most profitable location for manufacturing, Bulk-gaining & bulk-reducing, Considers transportation costs, labor costs, & agglomeration, Von Thunen Model: Predicts intensive/extensive land use based on proximity to CBD, Agricultural model created in 18th century, Assumes good are transported to market via cart, Primate City Rule : Largest city in a country is more than twice the size of next largest, More often found in less developed countries , Can result in uneven development within a country, Rank Size Rule: Second largest city is half the size of first largest , Third largest city is a third of the size of largest, More commonly found in MDC's. Indicates equitable development, World Systems Theory (Dependency Theory): Three system model (Core, Periphery, Semiperiphery), The core benefits at the expense of the P & SP, Explains uneven development are around the world,

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