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15. How does the diversification of a portfolio change its expected returns and expected risks? Is this in principle any diff
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15.The diversification of a portfolio results primarily in the reduction of risk.For a domestic portfolio,the diversification of the portfolio results in a weighted average expected return,but a reduction in risk as the returns of individual securities will be less than perfectly correlated.

This principle also applies to international diversification,but the definition of the market is expanded with many new securities with their respective risk,returns and correlations being added.The other added component of international diversifications is the introduction of currency risk.

16.A diversified portfolio has a systematic risk and unsystematic risk.Systematic risk is the risk of the market itself.Unsystematic risk is the risk of individual securities within the market and the portfolio.Increasing the number of securities in the portfolio reduces and ultimately eliminates the unsystematic risk,leaving only the risk of the market,unsystematic risk.

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