The paper investigates the effects of central bank interventions in financial markets, composed of asymmetrically-informed rational investors and noise traders. If the central bank suspects a bubble, it should lift the real risk-free rate to deflate the bubble in “leaning against the wind”. A rise in the real risk-free rate reduces the risk of rational informed investors, and increases the risk of rational uninformed investors. If the central bank intervenes through the nominal risk-free rate and the Fisher arbitrage condition holds, an increase in the nominal rate is transferred to inflation, thereby dampening the policy effect. Conversely, this implies that the central bank can also deflate the bubble by inducing a reduction in inflationary expectations. The effect on the informed investor risk remains ambiguous, while the risk of he uninformed investor grows, but only if they suffer from money illusion.

Additional Metadata
Keywords Central bank intervention, asymmetric information, rational investors, noise traders, bubbles, risk-free rate, Fisherian arbitrage, inflation, expectations, money illusion
JEL Asymmetric and Private Information (jel D82), Central Banks and Their Policies (jel E58), Portfolio Choice; Investment Decisions (jel G11), Information and Market Efficiency; Event Studies (jel G14), Financing Policy; Capital and Ownership Structure (jel G32)
Persistent URL
Series Econometric Institute Research Papers
Chang, C-L, Ilomäki, J, Laurila, H, & McAleer, M.J. (2019). Central Bank Intervention, Bubbles and Risk in Walrasian Financial Markets (No. EI2019-07). Econometric Institute Research Papers. Retrieved from