Reinsurance treaties are mutually beneficial agreements between insurance companies and reinsurers. In this arrangement, both parties agree to automatically accept a certain percentage of the insurer's business. This helps to spread risk and mitigate potential losses for insurers, while providing reinsurers with a steady stream of business. By working together, these parties are able to effectively manage risk and protect their financial interests. This type of agreement is a key aspect of the finance industry and plays a crucial role in the stability and success of the insurance market.