Broker quotes are an unreliable fallback for valuation: they can be hard to obtain and can vary by 20 to 30 percent for instruments such as mortgage-backed securities, which makes accurate valuation of those securities difficult.
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In addition, broker quotes may be difficult to obtain and can be quite unreliable—mortgage-backed securities, for example, can sometimes vary by 20 to 30 percent—making accurate valuation of these securities difficult.
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