  Suppliers (including companies and individual prosumers) may wish to protect
their private information when selling items they have in stock. A market is
envisaged where private information can be protected through the use of
differential privacy and option contracts, while privacy-aware suppliers
deliver their stock at a reduced price. In such a marketplace a broker acts as
intermediary between privacy-aware suppliers and end customers, providing the
extra items possibly needed to fully meet the customers' demand, while end
customers book the items they need through an option contract. All stakeholders
may benefit from such a marketplace. A formula is provided for the option
price, and a budget equation is set for the mechanism to be profitable for the
broker/producer.
