| Summary: | 碩士 === 國立中央大學 === 財務金融研究所 === 93 === The spot markets are often reported to be very volatile in the final settlement day or expiration day of the futures. The volatility is mostly due to manipulation. To examine the ways in which large traders make profit by manipulation, this article establishes the model of futures manipulation with the TAIEX Futures. This model demonstrates the strategies which the manipulators will take and whether manipulation
is worth it or not (i.e does the large trader earn positive expected profits by establishing a futures position and then trading in the spot markets to manipulate the spot price). If there is one manipulator in the markets, we find that the difference of the optimal quantity of each stock is their outstanding shares. We also show that the capital distribution on stocks is not only determined by the weight but also by the
basic price and market depth and what will happen when the manipulator increases his futures positions by an example. Furthermore, to adjust the model to fit the real world, we add the other trading volume of the stock markets and restructure the model under the uncertain state. Finally, this article provides another example for the model with the other trading volume and presents the importance of the monopoly power.
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