A seller's opportunity cost measures the a. value of everything she must give up to produce a good. b. amount she is paid for a good minus her cost of providing it. c. out-of-pocket expenses to produce a good but not the value of her time. d. consumer surplus.

An increase in the market price of men's haircuts, from $16 per haircut to $26 per haircut, initially causes a local barbershop to have its employees work overtime to increase the number of daily haircuts provided from 20 to 25. when the $26 market price remains unchanged for several weeks and all other things remain equal as well, the barbershop hires additional employees and provides 40 haircuts per day. what is the short-run price elasticity of supply? nothing (your answer should have two decimal places.) what is the long-run price elasticity of supply? nothing (your answer should have two decimal places.)