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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
More on [ Supply and demand ]
Products and Services :: Earth Sciences
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ASC Scientific - Geology equipment for the lab and for the field.
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Bico Inc. - Manufacturers of lab sized pulverizers, crushers, furnaces, ball mills, asphalt extractors, oil centrifuges, and other assay lab equipment.
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Brunton - Suppliers of the famous Brunton compass, and other equipment for outdoor research
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Contract Geological Services, Inc. - Equipment for exploration geology, including lots of field equipment, and some lab equipment. Everything but the Mule
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Corstor - borehole core storage systems and geological equipment.
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Dell Systems-Omnitron - Lightweight, portable, full function, Ground Penetrating Radar, with selection of antennas.
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Dr. F. Krantz, Rheinisches Mineralien-Kontor - Buying and selling collections (rocks, minerals, fossils). Also sells specimens, field equipment, and teaching aids for geology. Site in both English and French.
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Encardio Rite Geotechnical Instruments - Instruments for geotechnical, underground tunnels, dam and mining fields.
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Estwing - Manufacturer of hand-held striking and struck tools for geology and other uses (hammers, hoe-picks, chisels, axes, and pry bars).
Geology Micro Mineral Loupes - Geology magnifiers including doublet, and achromat micromineral loupes, hand lenses (2X to 20X), in metal holders from Indigo.com.
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GeoPen - Brand name of geophysical instruments manufactured by Research Institute of Engineering and technology, Changchun University of Sci. and Tech.
Geotechnical Instrumentation - Equipment for use in the geotechnical, mining and environmental engineering fields. Products include: piezometers, inclinometers, extensometers, settlement systems, and borehole packers.
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Kooter's Geology Tools - Basic geology field tools for students and professionals. Includes details about equipment, and tips for geologists.
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NSW Technology Limited - Manufactures underwater electrical and electro-mechanical cables. Applications include fibre-optic telecommunication links, dynamic cables for underwater remote operated vehicles (ROVs), geophysical, and oceanographic instrumentation.
Polytungstates Europe - Manufacturers of LST Fastfloat and chemical reagents. Describes heavy liquid properties of main product along with toxicity and usage.
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Rite in the Rain - Water-resistant field notebooks and paper.
Rockmans - Earth science supplies for the classroom and collector.
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Vancouver Petrographics - Offers geological laboratory services, rock cutting, polishing, geological studies and geological supplies and equipment.
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