Abstract: System and method of constructing entity knowledge base for a user entity creating an electronic marketplace for that entity. Entities can add entity data of one or more direct or indirect entities to their knowledge base. The entity knowledge base created provides a specific marketplace for any primary entity by allowing access to the restricted and unrestricted data associated with entities contained in the knowledge base of that primary entity. The system creates a general marketplace for any primary entity by allowing access to unrestricted data associated with all user entities in the system. Furthermore, each entity will contain confidence levels whereby these modifiable levels will determine the amount of access to data provided to associated entities included in a entity's knowledge base. The system will include methods to restrict access to knowledge bases of associated entities based on data contained in a primary-user entity.

Abstract: A system, method and apparatus where one party's item or plurality of items can be electronically exchanged for currency, goods and services or plurality of currency, goods and services of another party using a public network such as the internet. Users of the invention can create offers and make payment using currency, goods, services or a combination of currency, goods and services. A computer will store in a central database a list of items that are searchable to users of the system and items which are available for exchange. Users can store in a central database, items and services associated with the said user, to be available as a resource for an electronic exchange. The invention will provide the system, rules and processes in beginning, negotiating and completing an exchange. Invention will provide user interfaces, database search capabilities, user rating features and account management features to facilitate electronic exchanges.