Distribution of investment will make low-risk but low-yield investment such as compensation. But the explosion of investment, they cannot reduce the risk of explosion is all that investment will reduce the risk of a system-specific, that is, the risk of each type of securities, or the risk of each company, but there is still a risk that could not be dropped from the distribution of investment risk, that is not a political system, such as the risk of natural disasters, etc.
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