Abstract: A barter transaction system facilitates a barter transaction by determining a monetary compensation amount to compensate a party in a barter transaction when another party in the barter transaction fails to fulfill his/her obligation in the transaction. The barter transaction involves an exchange of a first non-monetary item from a first user with a second non-monetary item from a second user. The barter transaction system determines a compensation amount for compensating the first user based on a monetary value that the second user perceives of the second item. The perceived value is given by the second user and assigned to the second non-monetary item. The barter transaction system also allows the first and second user to negotiate the perceived value until both users agree to the barter transaction.

Abstract: An electrical circuit is provided with a substrate, preferably of synthetic polymer or coated paper, and an electrical circuit letterpress printed onto the substrate from ink comprising of electrical particles suspended in a resin. The resin may be an organic resin such as a soy resin, and the electrical particles may be electrically conductive such as metallic silver. The manufacture of conductors, resistors, capacitors and other electrical components is proposed. The circuit printing process is reliable and comparatively inexpensive and does not suffer from the inherent limitations of other additive printing processes.