Final answer:
It is rational to pursue a desire when the perceived benefits outweigh the perceived costs.
Step-by-step explanation:
When considering whether to pursue a desire, it is rational to do so when the perceived benefits outweigh the perceived costs.
This means that if the value of the benefits that will be gained from pursuing the desire is greater than the value of the costs associated with it, it would be rational to pursue it.
However, if the value of the costs exceeds the value of the benefits, it would not be rational to pursue the desire.
An example of when it would be rational to pursue a desire is when a student wants to earn a high grade on a test.
The benefits of studying and preparing for the test, such as gaining knowledge and improving their academic performance, outweigh the costs of spending time and effort studying.