Studies of the U.S. deregulation of the airline trucking andrail freight industr

Studies of the U.S. deregulation of the airline trucking andrail freight industries have revealed that:A)prices have dropped by one third to one half adjusted forinflationB)industry output has decreased adjusted for population growthC)these industries have remonopolized as firms have either mergedor gone out of businessD)deregulation ultimately harms consumers