関連ワード:  what is a contract in business law    what is a contract in business law pdf    what is a agreement in business law    what is a quasi contract in business law    what is a valid contract in business law    what is a void contract in business law    what is a voidable contract in business law    what is a unilateral contract in business law    what is a bilateral contract in business law    what is a contingent contract in business law