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Supply and Demand from Wikipedia
Supply and demand is an economic model of price determination in a market. It concludes that in a competitive market, the unit price for a particular good will vary until it settles at a point where the quantity demanded by consumers (at current price) will equal the quantity supplied by producers (at current price), resulting in an economic equilibrium of price and quantity.
The four basic laws of supply and demand are:[1]
If demand increases and supply remains unchanged, then it leads to higher equilibrium price and higher quantityIf demand decreases and supply remains unchanged, then it leads to lower equilibrium price and lower quantity.If demand remains unchanged and supply increases, then it leads to lower equilibrium price and higher quantity.If demand remains unchanged and supply decreases, then it leads to higher equilibrium price and lower quantity.
Link > http://en.wikipedia.org/wiki/Supply_and_demand
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