Dispersion within a risk category is different from that between different risk categories. Diversification within a risk category refers to the aggregation of different risks of the same type (e.g. stocks of different companies). Dispersion among different risk categories is achieved by aggregating different types of risks. For example, when an insurer combines two portfolios whose performance is not completely related, its overall risk exposure is usually lower than the sum of the risk exposures of individual portfolios.<br>
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