This paper investigates the expectation formation process of Japanese stock market professionals. By utilizing a monthly forecast survey dataset on the TOPIX distributed by QUICK Corporation, we sort forecasters into buy-side and sell-side professionals. We empirically demonstrate that the buy-side and sell-side professionals use either fundamental or trend-following strategies throughout their expectation formation processes and that they switch between fundamental and trend-following strategies over time. We also discuss that strategy switching can be key in understanding the persistent deviation of the TOPIX from the fundamentals.
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