Supposethatgasolinepricesincreasedramaticallythismonth.Lolacommutes100milestoworkeachweekday.Overthenextfewmonths,Loladriveslessontheweekendstotrytosavemoney.Withintheyear,shesellsherhomeandpurchasesoneonly10milesfromherplaceofemployment.Theseexamplesillustratetheimportanceof
A. the availability of substitutes in determining the price elasticity of demand.
B. a necessity versus a luxury in determining the price elasticity of demand.
C. the definition of a market in determining the price elasticity of demand.
D. the time horizon in determining the price elasticity of demand.