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Elasticity Cross elasticity of demand is a concept from economics which measures the response of demand on product Y when there is a change in price on product X. There are complements products, substitutes products and independent products, a products becomes a substitute when it becomes a replacement, which means that that consumer will use a new product to replace the original one when its price increases. It would also become a substitute when the ordinal good is short on supply or if it becomes very hard to obtain. When goods are substitutes they will always have a positive cross elasticity of demand, this means that as the price of product X goes up the demand on product Y will go up as well, for example we can say that if the price in iPhone keeps going up the demand on Galaxy will also go up since consumer will look for a more affordable smartphone. Another good example is as the price on coffee goes up the demand on tea will also go up since consumer will change to a new and more afortable alternative. There is also complement goods which are product that depend from each other. On complements goods the demand of Y product will increase as the price of X product decreases creating a negative cross elasticity of demand. A good example is the SUV demand and the gas prices, as the price of gas goes down the demand on SUV will go up. It could also work the other way around, as the price on product X goes up the demand on product Y will go down, and sticking with to the coffee example, as the price on coffee goes up the demand on coffee stir sticks will go down since people will purchase fewer coffees needing less sticks. One more concept on elasticity of demand is goods that are independent which are goods that have zero cross elasticity of demand. On independent product as the price on product X goes up the demand on product Y

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