Nash equilibrium is used all over the world in order to make decisions in such cases where the decision of the other party is known. For example: When a cricket match is taking place and one team wins the toss and chooses to bat, so that team would send its best batsman to bat at an opener and this decision would be known by the other team. Similarly, the opponent team would send the best bowler to bowl first and this would also be known by the first team. If the first team changes its decision and decides to send a batsman who just doesn’t bat that well, so it would not get any advantage from it until and unless the opponent team doesn’t change its decision to send a player who bowls just fine. So this means that at the current decision, both the teams are at Nash equilibrium because they have made best decisions and so equilibrium has been established.