Friction is reduced in a moving maglev train by lifting it above its track by magnetic repulsion. What are the advantages of reducing friction between the train and the track ?

Which of the following is a direct benefit of the use of assembly lines in production a. laws against theft fraud and coercion are needed to protect free choice. b. the government needs to plan efficient outcomes. c. competition among producers by itself cannot ensure a wide range of consumer choices. d. works pressure the government to guarantee minimum wages