and the older brother of billionaire investor George Soros. Died June 15. Mathew Gladstein, 90. Working with future Nobel winners Robert Merton and Myron Scholes, he helped popularize options trading while working at Donaldson Lufkin & Jenrette in New York. Died June 18. Gyula Horn, 80. The prime minister of

the value of the call options described above. The following outlines the history of the model and its primary inputs. • In 1973, Fisher Black and Myron Scholes derived what is today the most widely used and best-known theoretical model for the valuation of marketable options. • The Black-Scholes model cal

the value of the call options described above. The following outlines the history of the model and its primary inputs. • In 1973, Fisher Black and Myron Scholes derived what is today the most widely used and best-known theoretical model for the valuation of marketable options. • The Black-Scholes model cal

the value of the call options described above. The following outlines the history of the model and its primary inputs. • In 1973, Fisher Black and Myron Scholes derived what is today the most widely used and best-known theoretical model for the valuation of marketable options. • The Black-Scholes model cal