Contract = agreement Change civil rights & obligation. Establish terminate
Business contracts: contractors = traders Valid: - contractors: civil capacity falsity
- contents/objectives: comply with law mistake
- willing: not have any factors deception Intimidation Unable to aware of act -form: comply with law -> l i khai trái ng ờ c v ượ i giấấy t ớ thì coi nh ờ vô hi ư u ệ Performence
 Invalid, không có công ch ng văn b ứ ản, h p đôồng vô h ợ i u l ệ c ự
 Không có legal capacity => vì tài s n là c ả a family không ph ủ i c ả a ủ riêng Nga  Willingness (mistake)
 A -> B (invalid) => B->C Subject invalid valid To registration not yet registed -auction -Already registeredd Not subject to -stolen -imdemtifiable contract Registation - unimdemtifiable contract