... factor in building such an optimal portfolio. Investors are looking to have in their portfolios asset classes that are Investment Analysis and Portfolio Management 163 Pn Face value (nominal ... 0,30 46 ,10 Put 60 1,25 56,25 Call 20 0,25 20,00 Investment Analysis and Portfolio Management 159 9. What changes in investor’s circumstances cause the rebalancing of the investment portfolio? ... Investment Analysis and Portfolio Management 160 References and further readings 1. Arnerich, T., at al. (2007) Active .versus passive investment management: putting the debate into...