In the diploma thesis, I focus on fixed-coupon government bond portfolio risk management. Government bonds are supposed to be credit risk-free and very liquid, therefore a portfolio manager is mostly concerned about interest rate risk and reinvestment risk. Four models that reduce investor's exposure to the interest rate risk are presented: the duration model, the duration model with convexity, the M-Square model and the M-Absolute model. The duration model immunizes a bond portfolio against infinitesimal and parallel shifts in the time structure of interest rates if portfolio's duration matches investor's investment period and if the present value of portfolio matches the present value of investor's future financial liabilities. The duration model with convexity immunizes bond portfolio against parallel shifts even better if, in addition, the convexity of portfolio is equal to the convexity of liabilities. The M-Square model and the M-Absolute model immunize portfolio against any
changes in the time structure of interest rates. They are based on minimization of the M-Square measure and the M-Absolute measure of portfolio respectively. The difference between them is that the M-Square model considers portfolio's duration besides its M-Square measure, whereas the M-Absolute model only considers its M-Absolute measure.
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