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Price elasticity of demand is the responsiveness of quantity demanded of a good to a change in its price.Basically it describes how consumers react to a price change.The price elasticity of demand is calculated byPED= %Quantity demanded : % Change of Priceor in words: the percentage change in the quantity demanded divided by the percentage change in price
a change in demand is a movement along the demand curve, and a change in quantity demanded is a shift in the demand curve
Change in demand is subjective, it could be increase or decrease in the qauntity of good or services asked for, while change in quantity demand is objective, it refers to actual quantity/amount of good or seevices requested /demanded .
perfectly elastic demand the quantity change by infinitely large amount proportion due to the small change in price, is called perfectly elastic demand. perfectly inelastic demand the quantity demand doesn't change at all due to the change in price is called perfectly inelastic demand. relatively elastic demand the quantity demand changes by a little more percentage than the change in price is called relatively elastic demand. relatively inelastic demand the percentage change in quantity demand is less than the percentage change change in its price is called relatively inelastic demand unitary elastic demand the percentage change in quantity demand is equal to the percentage change in price is called unitary elastic demand
a table of bprices and quantity demand.
A change in quantity demanded
change in life style also causes change in quantity demand for eg: in 1960's formal wear were in demand but with change in style nowadays denim wear in demand.
When the percentage change in price is equal to the percentage change in quantity demanded then demand is said to be unit elastic. There are 3 kinds of price elasticity of demand.
by the formula : %changge in quantity demanded/% change in price of good
When the price changes, we call the resulting change in buying plan a Change in the quantity of demand. On the other hand, Change in demand is a change in the quantity that people plan to buy when any influence on buying plans other than the price of good changes.
This is based on the principle of an economics demand curve. A change in quantity continues to move along the same demand curve, whereas a change in demand shifts it either to the left or right of the original line. A change in the quantity or amount demanded is brought about by a change in the price of the item. For example, a price hike or sale. A change in demand on the other hand, is caused by other variables such as a change in tastes, income or competition from related goods.
Ed=% Change in quantity demanded/% Change in price=(Q2-Q1)/Q1/(P2-P1)/P1= P1 - Price before change P2 - Price after change Q1 - Quantity before change Q2 - Quantity after change Ed- Price elasticity of demand