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Equity Integration in Japan: An Application of a New Method

Andrew Rose

Monetary and Economic Studies, 2004, vol. 22, issue 2, 1-17

Abstract: This paper develops a simple new methodology to test for asset integration and applies it to the Japanese stock market as represented by the Tokyo Stock Exchange (TSE). The technique is tightly based on a general intertemporal asset-pricing model, and relies on estimating and comparing expected risk-free rates across assets. Expected risk-free rates are allowed to vary freely over time, constrained only by the fact that they are equal across (risk-adjusted) assets. Assets are allowed to have general risk characteristics, and are constrained only by a factor model of covariances over short time periods. The technique is undemanding in terms of both data and estimation. I find that expected risk-free rates vary dramatically over time, unlike short-term interest rates. Further, the TSE does not always seem to be well integrated in the sense that different portfolios of stocks are priced with different implicit risk-free rates.

JEL-codes: G12 (search for similar items in EconPapers)
Date: 2004
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