答案和详解如下： Q1、Which statement about renewable and non-renewable resources is most accurate? A) Land is considered a renewable resource. B) The supply curve for a non-renewable resource is perfectly elastic and the price is determined by demand for it. C) The known stock of a non-renewable resource must decrease as the resource is used. Correct answer is A)
Land is considered a renewable resource because using it in the present does not prevent its use in the future. The known stock of a non-renewable resource is fixed in the short term, but can increase in the long term as technology makes more of the resource accessible. The supply curve for a non-renewable resource is perfectly elastic at that price, and the quantity supplied is determined by demand. Q2、Which of the following best describes the elasticities of supply for renewable and non-renewable resources? Renewable resource Non-renewable resource
A) Perfectly inelastic Perfectly elastic B) Inelastic Perfectly inelastic C) Perfectly elastic Perfectly inelastic Correct answer is A) The supply (flow) of a renewable resource is fixed at any point in time. Therefore the supply is independent of price, or perfectly inelastic. Supply (stock) of a non-renewable resource is perfectly elastic, as the resource is supplied from its known stock at a price equal to the present value of its expected price in the next period. Q3、The supply of a renewable resource is: A) independent of price and perfectly elastic. B) dependent on price and relatively elastic. C) independent of price and perfectly inelastic. Correct answer is C) The supply of renewable resources over a period of time is fixed. The supply of renewable resources is, therefore, independent of price and perfectly inelastic. | 
发表于 2009-1-15 13:40
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