requirements to form valid contract
1) mutual assent (offer and acceptance)
2) consideration
3) no defenses to formation
consideration
bargained-for exchange of legal value between the parties
bilateral contract
exchange of mutual promises
unilateral contract
offeror-promisor agrees to pay upon completion of the act requested by the promisee; once act is completed, K is formed
quasi-contract
not a contract, but a restitution remedy designed to prevent unjust enrichment; an implied-in-fact K arises when there is an unenforceable or non-existent agreement, but one side has realized a benefit