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SML and CML Comparison The beta coefficient of an asset can be expressed as a function of the asset's correlation with the market as follows:

SML and CML Comparison
The beta coefficient of an asset can be expressed as a function of the asset's correlation with the market as follows:
Substitute this expression for beta into the Security Market Line (SML), equation below.
SML: ri = rRF +(rM - rRF)bi = rRF +(RPM)bi
This results in an alternative form of the SML.
ri = rRF +(rM - rRF)
ri = rRF +(rM + rRF)
ri = rRF +(rRF - rM)
ri = rM +(rM - rRF)
The correct equation is
III
.
Compare your answer to part a with the Capital Market Line (CML), equation below.
CML:
What similarities do you observe? What conclusions can you drawn?
When in this form, the CML and SML
have the same market price of risk
.
The measure of risk in the
CML
is \sigma p. The measure of risk in the
SML
is \rho iM\sigma i, and is
less
than for all assets except those which are perfectly positively correlated with the market.

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