Consider the utility function 
. Which of the following are true statements about the indifference maps represented by this function.
A.
MRS=-1 along the 45 degree line if and only if 
.
.B.
MRS=-1 along a ray steeper than the 45 degree line if and only if 
.
.C.
MRS=-1 along a ray shallower than the 45 degree line if and only if 
.
.D.
All of the above.
E.
None of the above.
Answer: A
Economics