The principal interest rate benchmark in Australia is the bank bill swap rate (BBSW), but there are questions about its accuracy (and we know overseas, other benchmark rates – such as LIBOR – have been rigged). So Guy Debelle RBA Assistant Governor (Financial Markets) spoke at the KangaNews Debt Capital Markets Summit and both discussed domestic reforms around the benchmark, and mentioned the possibility of introducing a ‘risk-free’ interest rate for the domestic market, as a complement to BBSW. He did not talk about the investigations that ASIC is currently undertaking into conduct around BBSW.
Given its wide usage, BBSW has been identified by ASIC as a financial benchmark of systemic importance in our market. It is important there is ongoing confidence in it. Without that, we have a serious problem, given its integral role in the infrastructure of domestic financial markets.
As you may know, BBSW was calculated for a number of years by, each day, asking a panel of banks to submit their assessment of where the market was trading in Prime Bank paper at a particular time of the day. While it was a calculation based on submissions, it differed from LIBOR in that BBSW submitters were asked about where the market for generic Prime Bank paper was trading that day. In contrast, LIBOR submitters were asked about where they thought their own bank’s cost of funds was that day.
In response to the prospect of a large number of the participants on the submission panel no longer being willing to provide submissions, the calculation of BBSW was reformed in 2013 in line with the IOSCO Principles for Financial Benchmarks, which were issued in July 2013.
Since 2013, the Australian Financial Markets Association (AFMA) has calculated BBSW benchmark rates as the midpoint of the (nationally) observed best bid and best offer (NBBO) for Prime Bank Eligible Securities, which are bank accepted bills and negotiable certificates of deposit (NCDs). Currently, the Prime Banks are the four major Australian banks. The rate set process uses live and executable bid and offer prices sourced from interbank trading platforms approved by AFMA, These platforms are currently ICAP, Tullett Prebon and Yieldbroker. The bids and offers are sourced at three points in time around 10.00 am each day.
Trading activity during the daily BBSW rate set has declined over recent years to very low levels. There are quite a number of days where there is no turnover at all at the rate set. The low turnover in the interbank market raises the risk that market participants may at some point be less willing to use BBSW as a benchmark. This is the motivation for the CFR’s consultation to ensure that BBSW remains a trusted, reliable and robust financial benchmark.
The likely key change to the methodology proposed is to calculate BBSW directly from market transactions – that is, calculating BBSW as the volume-weighted average price (VWAP) of market transactions during the rate set window. Given the objective is to better anchor BBSW to transactions in the underlying market, the RBA supports moving the calculation methodology to the VWAP.
With regards to the risk-free benchmark:
Next I would like to briefly raise some issues around whether the use of BBSW needs to be quite as widespread as it is. In a number of instances, BBSW has become the default reference rate without much thought being given as to whether it is the most appropriate reference rate. BBSW is a credit‑based reference rate. It is based on the borrowing costs of the major banks, with the credit risk that entails embodied in the rate.
For a number of purposes, a credit‑based rate is completely appropriate. However, for other purposes, a rate that is closer to risk‑free may be more appropriate. For instance, in recent years, market participants have moved to use overnight-indexed swap (OIS) rates more often when discounting the cash flows in their swaps. The FSB, through its official sector steering group (OSSG) on benchmark reform, is encouraging market participants to contemplate switching from credit‑based benchmark rates like BBSW or LIBOR to risk‑free rates, where appropriate.
In the local market, there appears to be growing interest in using risk-free rates as benchmarks. Such a rate could be backward looking, like the cash rate, or forward looking, like OIS rates. As a first step, some market participants have indicated that a total return index of the cash rate would be a useful backward-looking benchmark. Implementing this would be straightforward, since the RBA already calculates and publishes the cash rate. Some market participants are also interested in referencing a forward-looking rate with equivalent tenors to BBSW, and we will continue to work with AFMA on the development of such a benchmark.
One example where a change in reference rate could be contemplated is for floating rate notes (FRNs) issued by governments. FRN coupon payments are typically priced at a spread to BBSW. While referencing BBSW makes sense for FRNs issued by banks, it is less clear why governments should tie their coupon payments to a measure of bank funding costs.
That is one example worthy of consideration. There are a number of others. I know this is not necessarily an issue you may have thought that much about until now. At the very least, I would encourage you to at least ask the question whether the product you are issuing or holding is using the most appropriate reference rate.
