Answer:
All of the above
Explanation:
A. make simplifying assumptions.
B. include all available information.
C. must use mathematical equations.
D. attempt to duplicate the real world.
all four options are what make a good economic model. assumptions are very important to simplify the underlying model. the information available including facts and figures is pivotal. Mathematical equations are used to prove a model. And attempt is made to duplicate the real world as nearly as possible.
