Economic cost of production differ from accounting costs in that A. accounting cost includes expenditures for hired resources while economic cost does not. B. economic cost includes expenditures for hired resources while accounting cost does not. C. accounting costs are always larger than economic cost. D. economic cost adds the opportunity cost of a firm using its own resources while accounting cost does not.

In the 1970s, kmart used blue light specials to encourage customers to flock to a particular department having a temporary sale. a spinning blue light activated for approximately 30 seconds, and then an in-store announcement informed shoppers of the special savings in the specific department. over time, loyal kmart shoppers learned to flock to the department with the spinning blue light before any announcement of special savings occurred. if kmart was employing classical conditioning techniques, what role did the spinning blue light play?