Use the formula 
to determine the period of f (x) . 
Definitions:
Risk Premium
The additional return expected by an investor for taking on a higher risk compared to a risk-free investment.
Multifactor APT
A finance model that describes asset prices by taking into account several risk factors, expanding on the Arbitrage Pricing Theory by including multiple variables.
Risk Premiums
Additional returns expected by an investor for taking on additional risk, over and above the risk-free rate of return.
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