We are developing agent-based financial market models. In this paper, we discuss the effects of passive investment strategies and asset fluctuation phenomena using our agent-based simulator. Main results include that (1) passive investment is usually effective, however, the market values do not follow the fundamentals and also become unstable, when the number of passive investors is too large, (2) the variety of investors is dramatically changed, according to the evaluation criteria of investment, and (3) there remain both active and passive investors, when there are so many investors with different strategies. The contribution of the paper is to uncover the properties of passive investment strategies in a behavioral finance domain through agent-based modeling.
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