Answer:
The measure of price elasticity of demand carries a minus sign because it shows an inverse relationship between price and quantity demanded i.e., 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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