Express contracts are easy enough to understand. An express contract is a legally enforceable agreement formed by an exchange of promises, the terms of which are declared, either orally or in writing, at the time the agreement is formed. A mutual meeting of the minds is required, and the agreement must be supported by consideration. If I promise to pay you $10 to wash my car, and you accept my offer and proceed to wash my car, we’ve formed a contract and I am legally obligated to fork over that $10. But what if you just decided on your own to wash my car without discussing it with me first? Or maybe I ask you to wash my car and you accept, but we never discuss price? In situations like these, I may still be required to pay you a fair price for the service you provided, even though we never actually formed a contract. The legal concepts involved are known as unjust enrichment and quantum meruit. Let’s review what these related-but-distinct terms mean.