A demand curve shows the relationship between price of a certain commodity and the quantity demanded at that price level for that commodity at ceteris paribus condition. The concept and shape of demand curve for a normal good generated from the 'law of demand'. For narmal good, the shape of demand curve looks like negatively sloping downward curve, if price is being measured along vertical axis and quantity demanded is measured along horizontal axis. Well, the shape of demand curve changes with respect to the characteristics of goods.
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