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Portfolio Balance, Price Impact, and Secret Intervention

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  • Martin D. D. Evans
  • Richard K. Lyons

Abstract

This paper tests the portfolio-balance approach to exchange rate determination in a new way. Past work on portfolio balance in foreign exchange falls into two groups: (1) tests using measures of asset supply and (2) tests using measures of central-bank asset demand. We address the demand side, but we use a broad measure of public demand, rather than focusing on demand by central banks. Under floating rates, changing public demand has no direct effect on interest rates, current or future. This provides an opportunity to test for portfolio-balance effects on price. We develop and estimate a micro portfolio-balance model that has both Walrasian and microstructure features. Portfolio-balance effects are clearly present: the immediate price impact of public trades is 0.44 percent per $1 billion (of which, about 80 percent persists indefinitely). This estimate is applicable to central-bank trades as well, as long as they are sterilized, secret, and provide no monetary-policy signal. Intervention of this type is most effective when the flow of macroeconomic news is strong.

Suggested Citation

  • Martin D. D. Evans & Richard K. Lyons, 2001. "Portfolio Balance, Price Impact, and Secret Intervention," NBER Working Papers 8356, National Bureau of Economic Research, Inc.
  • Handle: RePEc:nbr:nberwo:8356
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    JEL classification:

    • F31 - International Economics - - International Finance - - - Foreign Exchange
    • G12 - Financial Economics - - General Financial Markets - - - Asset Pricing; Trading Volume; Bond Interest Rates

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