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The discount factor, DF(T), is the factor by which a future cash flow must be multiplied in order to obtain the present value. For a zero-rate (also called spot rate) r , taken from a yield curve , and a time to cash flow T (in years), the discount factor is:
The utility of an event x occurring at future time t under utility function u, discounted back to the present (time 0) using discount factor β, is (). Since more distant events are less liked, 0 < β < 1.
Forward Discount Rate 60% 40% 30% 25% 20% Discount Factor 0.625 0.446 0.343 0.275 0.229 Discounted Cash Flow (22) (10) 3 28 42 This gives a total value of 41 for the first five years' cash flows. MedICT has chosen the perpetuity growth model to calculate the value of cash flows beyond the forecast period.
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The discount factor determines the importance of future rewards. A factor of 0 will make the agent "myopic" (or short-sighted) by only considering current rewards, i.e. (in the update rule above), while a factor approaching 1 will make it strive for a long-term high reward. If the discount factor meets or exceeds 1, the action values ...
Hyperbolic discounting is mathematically described as = + where g(D) is the discount factor that multiplies the value of the reward, D is the delay in the reward, and k is a parameter governing the degree of discounting (for example, the interest rate).
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Let [2] = (())be the bank account or money market account numeraire and = / = (())be the discount factor in the market at time 0 for maturity T.If is the risk neutral measure, then the forward measure is defined via the Radon–Nikodym derivative given by