Eurosystem Monetary Policy Auctions: Fixed & Variable Rates

The Eurosystem employs two primary types of auction procedures for its liquidity operations: fixed-rate auctions and variable-rate auctions.

Fixed-Rate Auctions (TF)

In a fixed-rate tender (TF), the European Central Bank (ECB) predetermines the interest rate. Counterparties then submit requests for the funds they wish to obtain at this rate. The interest rate is unique, fixed, and uniform for all participants.

Once the ECB decides on the total amount of liquidity to inject in a fixed-rate auction, the award is made pro rata among the bids from various entities. This allocation is based on the relationship between the quantity allotted and the total amount bid. The amount allotted to each entity is the result of applying the award percentage to the amount requested by that entity.

Variable-Rate Auctions (TV)

In a variable-rate (TV) auction, counterparties bid both the amounts of money and the interest rates at which they wish to conduct the operation. The ECB sets a minimum bid rate for TV auctions to signal the direction of its monetary policy. This minimum rate serves as the Eurosystem's reference rate, changing only in response to shifts in the monetary policy stance.

In a variable-rate (TV) liquidity auction, bids are ranked in descending order by their proposed interest rates. Bids with the highest interest rates are satisfied first, followed successively by those with lower interest rates, until the total liquidity to be awarded is exhausted. For the lowest interest rate awarded, i.e., the marginal rate of award, the allocation is made pro rata among the bids, depending on the overall amount of liquidity the ECB decides to award.

Variable-Rate Auction Types

• Single-Rate Auction (Netherlands): The marginal rate applies to all accepted bids.
• Multiple-Rate Auction (American): The award rate for each bid is equal to the interest rate offered in that specific bid.

Evolution of Eurosystem Auction Procedures

From 1999 until June 2000, the Eurosystem conducted its main refinancing operations (MROs) primarily using fixed-rate (TF) tenders. However, from June 27, 2000, it transitioned to using variable-rate (TV) auctions with a multiple-rate award procedure.

This significant change was prompted by substantial overbidding that occurred during the earlier period. This overbidding was largely due to a persistent spread between the EONIA rate and the interest rate of the MROs conducted via TF tenders. This differential encouraged excess liquidity demand from the ECB for subsequent higher-rate lending in the interbank market. With the shift to a multiple-rate auction, credit institutions seeking larger volumes must now pay a higher price, thereby eliminating the benefits of the previous system.

Furthermore, the Eurosystem began publishing weekly estimates of the banking system's liquidity needs, enhancing transparency and market understanding.