PROBLEM TO BE SOLVED: To propose an option price determination method of realistically and rationally calculating an option price.;SOLUTION: The option price determination method includes: a step of receiving and storing the list of price data in the market of property from an information source; and a step of receiving the determination request of the option price of the property, and determining an option price by using the list. The request includes: a property price S, authority execution price K, non-dangerous property interest rate r per prescribed period, residual period t of option, and dividend tendency q obtained by continuous compounding calculation. The step of determining the price includes: a step 102 of calculating an earning rate in an applied period on the basis of the list; a step 104 of inverting the negative code of the earning rate; a step 106 of calculating volatility v by adapting the distribution of the earning rates whose negative codes have been inverted with a half normal curve; and steps 120-134 of determining the option price of the property as the functions of v, S, K, r, t and q.;COPYRIGHT: (C)2013,JPO&INPIT
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