In microeconomic theory, the partial equilibrium supply and demand economic model originally developed by Alfred Marshall attempts to describe, explain, and predict changes in the price and quantity of goods sold in competitive markets. The model is only a first approximation for describing an imperfectly competitive market. It formalizes the theories used by some economists before Marshall and is one of the most fundamental models of some modern economic schools, widely used as a basic building block in a wide range of more detailed economic models and theories. The theory of supply and demand is important for some economic schools' understanding of a market economy in that it is an explanation of the mechanism by which many resource allocation decisions are made. However, unlike general equilibrium models, supply schedules in this partial equilibrium model are fixed by unexplained forces.
Science Instruments and Science Supplies

Advanced Geosciences, Inc. - Manufacturer of the Sting R1 IP resistivity meter / IP meter imaging system. Now with patent pending dual-mode electrodes in a multi-electrode system.
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Endecotts - Test sieves, shakers and filters for particle size analysis.
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Glenammer Engineering - Manufacturer of laboratory test sieves.
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Kovacs Enterprise - Complete pictures and descriptions of ice drilling and coring equipment manufactured.
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Optical Sensors for Meteorology - Optical sensor products primarily aimed at meteorological purposes. Some information also provided on products in development.
UltraViolet Lights for Fluorescent Mineral Collecting - Ultraviolet lights and accessories for professionals and hobbyists interested in the UV spectrum.
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