b. Kinko’s, which has a photocopy store near many colleges and universities
c. USX Corporation, which owns ore and coal mines, coke ovens, blast furnaces, mills,
and foundries
d. Intel, which makes computer chips for most of the computer manufacturers
e. Century 21, which has real estate offices that help people sell a house in one city and
buy another house in another city
All economic models must involve simplifications because
a. economists would be unable to command high salaries if their models were so simple
that anyone could understand them
b. human behavior is very erratic and unpredictable
c. reality is too complex to understand in its entirety, so we must reduce it to a level that
we can understand
d. they always try to duplicate all possible information and cover all possible variables
that might influence decision making
e. we must rely on value judgments and ignore reality