The Missouri Effect of Execution by the Parties refers to a legal doctrine that affects the enforceability of a contract when both parties have partially performed their obligations. This doctrine recognizes that once the parties have substantially performed their duties under the contract, it may be unfair to allow one party to back out without consequences. Under the Missouri Effect of Execution by the Parties, the courts are more willing to enforce the contract and ensure that both parties are held accountable for their performance. This doctrine is especially significant when it comes to contracts involving services or complex transactions, as it helps protect the interests of the performing party. There are two main types of the Missouri Effect of Execution by the Parties: Complete Performance and Substantial Performance. 1. Complete Performance: This occurs when both parties fully and precisely perform their obligations under the contract. In such cases, the court will strongly favor enforcing the contract and allow the non-breaching party to seek legal remedies if the other party fails to fulfill their obligations. 2. Substantial Performance: In some instances, a party might not completely fulfill their obligations, but their efforts are so close to complete performance that it is considered substantial. The court will generally allow the contract to be enforced, and any deviations from full performance may be addressed through damages rather than denial of enforcement. The Missouri Effect of Execution by the Parties is based on the principle of fairness and preventing unjust enrichment of either party. It considers the efforts and investments made by the performing party, aiming to avoid situations where a party could simply walk away while benefiting from the partial performance of the other party. In conclusion, the Missouri Effect of Execution by the Parties is a legal doctrine that ensures contracts are enforced, even in cases of partial performance. It protects the interests of the performing party by allowing them to seek remedies for any breach by the other party. By recognizing both complete and substantial performance, this doctrine contributes to a fair and equitable resolution of contractual disputes in Missouri.