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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.
Supply
Supply is the quantity that producers are willing to sell at a given price. For example, the potato grower may be willing to sell 1 million lb of potatoes if the price is $0.75 per lb and substantially more if the market price is $0.90 per lb. The main determinants of supply will be the market price of the good and the cost of producing it. In fact, supply curves are constructed from the firm's long-run cost schedule. Supply curves are traditionally represented as upward-sloping because of the law of diminishing marginal returns. This need not be the case, however, as described below.
Special cases of a supply curve
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Soil and Sediment :: Products for Sampling and Monitoring
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Aquaflex - Vendor information about a sensor that measures both soil moisture and soil temperature over a large volume of soil.
Meta Description: [ Aquaflex soil moisture meters from Streat Instruments give accurate measurements of soil moisture and soil temperature over a large volume of soil. These soil moisture meters are robust, reliable, simple to install and maintenance free. ]
Earth Systems Solutions - Soil moisture monitoring and sampling instruments for soil science, agricultural, irrigation, and environmental applications.
Meta Description: [ Moisture monitoring and sampling: tensiometers, transducers, lysimeters, capacitance, compressor/extractors, ceramics. Sensores para el monitoreo de la humedad del suelo: tensiometros, transductores. ]
Kel Instruments Co. Inc. - Specializing in soil pH and salinity test instruments.
Soilmoisture Equipment Corp. - Manufacturer of instruments to measure and extract soil moisture. Products include tensiometers; extractors, compressors and manifolds; plant water status console; salinity sensing equipment; soil permeability equipment; samplers; and related instrumentation and electronic systems.
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