• not creation of law but by merchants to allow them to deal with merchandise without having to physically carry them around
• pertains to specific type of movables only : GOODS
2 FUNCTIONS
1. evidence of existence & possession of goods described therein
2. medium by which seller is able to transfer possession of goods
2 FORMS
1. negotiable
a. deliver to bearer (negotiation by mere delivery)
b. deliver to specific person or his order (negotiation by endorsement + delivery)
• even if face of instrument says NON-NEGOTIABLE, it is still NEGOTIABLE; limiting words does not destroy negotiability
• if order instrument & no endorsement was made – equivalent to assignment
2. non-negotiable