Answered

Internet comparison shopping sites like shopping.com and pricegrabber.com allow consumers to compare prices of substitute products much more easily than is possible without the internet. these sites have:

Answer :

The answer is; "these sites have increased the cross-price elasticity for substitute products".

When we evaluate the responsiveness of the demand for any good towards the change in the price of a related good is known as cross price elasticity of demand and it is always measured in terms of percentage. 

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