Efficiency comes about in perfectly competitive free markets when:

Efficiency comes about in perfectly competitive free markets when:
 
  a. Firms are motivated to invest resources in industries with a high consumerdemand and move away from industries where demand is low.
 b. Firms are encouraged firms to minimize the resources they consume to produce acommodity and to use the most efficient technologies.
 c. Commodities are distributed among buyers such that buyers receive the mostsatisfying commodities they can purchase, given what is available to them and
 the amount they have to spend.
  d. All the above
  e. A & B