Do you think it's good to have a rival?

Having a rival can affect your the present and the future performance. Long-term rivalries boosted performance over years. Rivalries ca exist in different fields such as between friends, sports teams, schools, political parties, families etc. Rivalries develop from the product of competition and ritualism between different parties. In some cases, rivalry can become so consuming that actors worry only about whether their actions will harm or benefit their rivals.

im not to sure