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Supply vs Demand
Abstract
Supply and demand are two important concepts in a marketplace. These concepts are dynamic and vary from market to market. The objective of this paper is to compare and contrast the supply and demand concepts based on available scholar material. The comparison involves reviewing the literature material under the definitions of demand and supply; the relationship between supply and demand; the effect of supply and demand on the market; and the factors affecting demand and supply in the United States of America. The review uses book materials in economics including the classical economics.
Definition of demand and supply
The demand in economics is defined as the quantity of a good or service that consumers are willing and able to purchase at a given price during a given period of time, (Richard Ely, 1919). In economics, demand is greater than a desire to purchase. Richard argues that a beggar, for instance, may desire a good house, but due to lack of money to pay for the house, the demand becomes ineffective. Such a demand has no purchasing power. Thus, demand in a market is dependent on desire, affordability and willingness to purchase.
Supply is defined as the number of goods and services that the seller is willing to sell at a given price, (Richard Ely, 1919). Richard clearly states that supply is seller-centered. Like the demand concept, supply depends on the availability of goods, the price of the goods and the willingness of the seller to sell the goods or services.

Relationship between supply and demand
The demand and supply are linked by the price of the price of the goods and services, (Miller Jones, 1972). Miller shows that the supply of a commodity is directly proportional to the amount price of the commodity. The supply curve is upward sloping. The supplier to the market would