【单选题】If the price elasticity of demand for airline travel is 0.52 in the short run and 1.46 in the long run, then the demand for airline travel is ________ in the short run and ________ in the long run.
【简答题】suppose the price elasticity of demand for heating oil is 0.2 in the short run and 0.7 in the long run. if the price of heating oil rises from $1.8 to $2.2 per gallon, what happens to the quantity of ...