Computer system for assisting in transactions based on price of proxy physical items

摘要

A computer system for assisting in transactions of a financial instrument is disclosed. The financial instrument is a contract based on the price of a proxy physical item, and is listed for sale or trading. The transaction includes receiving from a party 20 a long position payment of the full value of the financial instrument and also receiving from another party 60 a short position payment of a margin 70. The full value of both payments is invested to yield an interest income stream 50 that is paid to the short position party 60. An attached yield income 90 of the financial instrument is received from the short position party and paid to the long position party 20.