backward L-shaped

L-shaped

upward sloping lines

downward sloping lines 

are negatively sloped

are contour lines of a utility function

all of the above

are nonintersecting

exists because of limited resources

exists because the price of goods is too high

will eventually be solved by better planning

arises only in poor countries

enjoys bundle A and B equally

prefers bundle B to bundle A

bundle A contains the same goods as bundle B

prefers bundle A to bundle B

the ratio of the prices (P_x/P_y)

the negative of the ratio of the prices (P_x/P_y)

the ratio of income divided by price of Y (I/P_y)

none of the above

the model may fail to acknowledge that economic actors will change their behavior in response to changing situations

researchers are pessimistic about the future

the model may make predictions that conflict with widely held opinions

no one cares about these predictions

4

3

2

5

9

8

10

7

the graph rotates about its Y-intercept

the graph shifts either up or down

the graph remains unchanged

the graph rotates about its X-intercept