According to economists, when two people make the exactly opposite decision:

a. one of them is acting irrationally.

b. each person evaluates the situation according to his/her individual self-interest.

c. one of them is acting out of spite.

d. one of them should compromise.

b. each person evaluates the situation according to his/her individual self-interest.

Explanation:

This can be generally seen in ancient and modern form of economics where in the course of their works, they can end up countering themselves in the midst of a project.

Here, or in a case of such, a great part of economics deals and accommodates psychology an the both economics that have probably found themselves in the field are expected to evaluate the situation according to each others self interest; especially when knowing the risks, pros and negative effect of the activities that is been carried out.

Secondly, this model is a useful measurement device by which economic situations can be evaluated and also levels of competition that exist in real markets can be checked.