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Elasticity is the tendency of a body to return to its original shape after it has been stretched or compressed. Elasticity can be elastic and inelastic. If elasticity is greater than one, the curve is considered to be elastic. If it is less than one, the curve is said to be inelastic. This essay will take the case of rice to explain the relevant factors that influence the price elasticity of supply and demand.

The first thing to be discussed is demand elasticity. First factor is the number and closeness of substitute goods. The more substitutes they are for a good, the more alternatives for people to switch. In other words, there will be more competition. Greater competition will make the price elasticity of demand more elastic. (Grant and Vidler. 2000 Demand elasticities, Economics in context P36. Heinemann Educational) Returning to our examples of rice, there is less close substitute for rice and thus demand is relatively inelastic. Maybe bread and noodles can be the substitute of rice, but the person who likes eat rice would not change their habit so there will be less change in elastic. Second factor is the proportion of income spend on the good. “The higher the proportion of income we spend on a good, the more we will be forced to cut consumption when its price rises and the more elastic will be the demand.” (Sloman, J.2007. P56) An investigation shows that the average price of rice is 5 Yuan and the average income of people is 9000 Yuan every month. We spend a tiny fraction of our income on it, so rice is an inelastic good. Moreover, necessity is another factor. As we all know, food is really important in our life, people cannot live without food and rice is a kind of main food for human beings. So food must be inelastic. Suppose if rice is elastic, a small change in price will lead to a big change in quantity, there will be a shortage and not

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