“Use of the Black and Scholes Model in the Pricing of Purchasing Options Based on the Index of the Iraq Stock Exchange for the Period from 6 2 to 25 2 2019”. Journal of University of Human Development, vol. 5, no. 2, May 2019, pp. 68-78, https://doi.org/10.21928/juhd.v5n2y2019.pp68-78.