The buyer can initiate different types of bidding:

• Request for proposals is a competition where the price of the product may include the cost of delivery (but not necessarily). Functionally, this auction is no different from the Request for Prices auction. But the supplier may add delivery costs to the price of the product or regulate the delivery price in a separate agreement.
• Request for prices is a competition where the offered price of a product does NOT include the cost of delivery. Functionally, this auction is no different from the Request for Proposals auction.
• Reduction - bidding with a decrease reduction in price (decreasing bidding for a fall). As a rule, at the conclusion of the contract when concluding a contract, a tender is held, but there are times cases when it is necessary to carry out an additional reduction between several participants.
• Auction - a public sale of products, securities, property of enterprises, works of art and other objects, which is carried out according to pre-established auction rules.
• The reduction can be carried out both per unit of goods and per lot.
• Purchasing from a single source Supplier selection - is used by the contractor counterparty to select a supplier according to specified conditions.