But, you might say, the behaviour of borrowers and lenders, whether rational or based on distorted expectations, ultimately depends on interest rates. Only if interest rates are low, can such a dynamic develop. Interest rates in turn are strongly influenced by central banks. In the last part of my speech I would like to address this argument, and discuss the question that has come back into focus since the financial crisis: What role do central banks play in the event of excesses and crises on the credit market? The fundamental task of central banks like the SNB is to ensure price stability, while taking due account of economic developments (cf. slide 17). The main instrument they use for this are key or reference interest rates. If, for example, the inflation rate threatens to fall too low, key rates are lowered. This has a positive impact on price development via various channels. 19 One of these is loans: An interest rate cut reduces borrowing costs and creates incentives for expanding the credit supply. This encourages investments and consumer expenditure and ultimately has a positive effect on price development, too. With their interest rate decisions, central banks therefore consciously influence lending practice. If, for price stability reasons, interest rates have to be kept low for a prolonged period, it is possible that over time there  18  SFBC (1998). 19  The literature distinguishes different channels through which monetary policy can impact on aggregate demand and thus inflation.
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).