Answer:
The measure of price elasticity of demand of normal good carries minus sign as there exists an inverse relationship between demand and price of the good. That is, other things remaining constant, as the price of a good rises (or falls), the quantity demanded of the good falls (or rises). On the other hand, price elasticity of supply carries plus sign as there exists a positive relationship between the supply of a commodity and its price. To put in other words, when the price of a good rises (or falls), then the quantity supplied will increase (or decrease), other things remaining unchanged.
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