
101Decision Analysis with Multiple Attributes
Now Bill is asked some questions to determine his trade-off behavior
over deterministic combinations of the two attributes. For example, con-
sider two drills with the attributes at {500 rpm, $30} and {1,500 rpm, c?}.
Bill is asked what value of the cost of the second drill will make him
indifferent between the two drills. Clearly, the value should be greater
than $30 because the second drill has higher rpm. Let us say that Bill says
he is willing to pay $50 for the second drill. We can now write the indif-
ference equation:
()
()()
−
−
=
−
−
=
500 200
30 10
1500 200
50 10
300
1300
or
a
T