to 2017. unlike monetary policies, there has been far limited literature on how macroprudential measures should be calibrated with respect to changes in asset price levels. the complex dynamics underlying the property market in hong kong has made it very difficult, if at all possible, to develop an ex ante framework governing how the hkma should operate its macroprudential policies. so, what we have done is to tread extremely carefully in each round of adjustment. the hkma has established a cross - departmental committee to regularly review whether the prevailing macroprudential measures would need to be adjusted, taking into account a host of factors including the property price trend, transaction volumes, domestic economic fundamentals and the external environment. the committee is chaired by the chief executive of the hkma and comprises members coming from multiple functions including monetary management, banking supervision, research and macro surveillance. 1 / 3 bis central bankers'speeches 6. some commentators have criticised the hkma ’ s macroprudential measures as being ineffective because they have not been able to arrest the rising trend of property prices. this is a misunderstanding of the objective of the hkma ’ s macroprudential measures. the objective of the hkma ’ s measures is not to tame property prices. instead, they are aimed at strengthening the risk management of banks and thus safeguarding long - term banking stability. in this regard, it is worth noting that the average ltv ratio of new residential mortgage loans has been consistently lower than 60 % while the average debt servicing ratio of new mortgages has been consistently lower than 40 %, suggesting that the banking system has built in buffer to safeguard its resilience. 7. competition dynamics : mortgage products in hong kong are homogeneous, in the sense that from the mortgagor ’ s perspective it makes little difference which bank is offering the mortgage facility. there is therefore a strong tendency for banks to compete for market share by lowering their underwriting standards. with the macroprudential measures in place, however, banks can compete for mortgage business only in terms of pricing ( e. g. mortgage rate ). against a backdrop of rising property prices and a consistently low delinquency rate of mortgage loans, many banks tried to outcompete their peers by pushing down the mortgage rate to record low levels. we were concerned that the low mortgage rates banks charge might not be adequate to cover the potential credit loss if property prices were to correct sharply in the future. the hkma has

arthur yuen : remarks discussant´s remarks by mr arthur yuen, deputy chief executive of the hong kong monetary authority, at the ampf 2021 and mas - bis conference on macro - financial stability policy, 28 may 2021. * * * opening 1. it gives me great pleasure to share my views on hong kong ’ s experience in the use of macroprudential measures to safeguard financial stability. i am grateful to mr ( robert ) mccauley and professor ( catherine ) schenk for their research efforts, and their recognition of the effectiveness of the macroprudential measures implemented by the hong kong monetary authority ( hkma ) since the 1990s. the importance of macroprudential policies 2. today ’ s discussion on macroprudential policies is timely considering recent market developments. the accommodative monetary policies adopted by major economies in response to the covid - 19 health crisis have provided renewed impetus to rising property and asset prices in many markets. how to rein in asset price inflation and prevent it from endangering financial stability in the event of an abrupt price adjustment is a topical issue within the central banking community. 3. as mentioned in robert and catherine ’ s joint paper, the hkma ’ s macroprudential measures on mortgage lending were first introduced in 1991. they have helped hong kong weather several crises including the asian financial crisis, during which property prices plunged by as much as 70 % between 1997 and 2003. being an early adopter, we are encouraged to see that macroprudential measures have gained wider international acceptance after the global financial crisis ( gfc ). many jurisdictions have implemented macroprudential measures similar to those in hong kong, including loan - to - value ratio ( ltv ) caps and stress testing on the mortgagor ’ s ability to cope with interest rate rises in terms of their repayment ability. challenges and mitigation : calibration of macroprudential policies 4. i would like to take this opportunity to share our experience gained since the gfc in operating our macroprudential measures on mortgage lending. my remarks would focus on what i call the “ 4cs ”. 5. calibration : driven by the low interest rate environment and limited housing supply, residential property prices in hong kong continue to grow since the gfc. this has posed increasing risks to financial stability in hong kong. in response, the hkma implemented 8 rounds of tightening of the macroprudential measures from 2009