For each of the following pairs of investments, indicate which would always be preferred by a rational investor (assuming that these are the only investments available to the investor):

a.

Portfolio A

r = 19%

= 21%

Portfolio B

r = 15%

= 21%

Preference

	Portfolio A
	Portfolio B
	Indeterminate

b.

Portfolio C

r = 20%

= 21%

Portfolio D

r = 18%

= 15%

Preference:

	Indeterminate
	Portfolio C
	Portfolio D

c.

Portfolio E

r = 9%

= 15%

Portfolio F

r = 9%

= 9%

Preference:

	Portfolio E
	Portfolio F
	Indeterminate