Although, Nash equilibrium has played a great role in helping groups and individuals in making the best decision easily, but it has made economics useless. If a party knows the strategies of the other party then the all the calculations that can be made in order to make that decision would be wrong and so since they would be different from the obvious, they would be incorrect.
Nash equilibrium has had a great impact on the decision making by people but in many cases, the decisions that are made are wrong and would not give maximum amount of advantage. If both parties choose to change their decisions then a much better result can be obtained. When both parties find out the strategies of the other party so they should use the economic theories and formulas and then acquire a much better result.
If both parties talk to each other, they would be able to form a better understanding of the strategies and goals of the other party and so they would be able to establish a much better result. The economical tables and calculations would be of great help in the decision making and it would help in making a clearer and much better decision which is impossible if Nash equilibrium is used.