Write down demand and supply equations for wireless phones; include two exogenous
variables in each equation.
Draw a supply‐demand graph
for wireless phones.
Use your graph to show how a change in one
of your exogenous variables affects the
model’s endogenous variables.

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?