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Foundations of CFE Exam Old Financial Economic Theory Forum

View Poll Results: How do you do discounting when it's not specified in the question?
Continuous discounting: S * exp(-r%*t/12) 8 61.54%
Effective annual rate: S / (1+r%)^(t/12) 3 23.08%
Annual percentage rate: S / (1+r%*t/12) 0 0%
Others: Please specify 2 15.38%
Multiple Choice Poll. Voters: 13. You may not vote on this poll

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Old 04-23-2012, 02:05 PM
ASstudent ASstudent is offline
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Default General question on how do you do discounting?

When you are given interest rate = r% p.a. and the question does not specify how discounting should be done. Which approach would you use?

While it's intuitive for some models (e.g. continuous discounting as a part of Black-Scholes formula), let's assume something in a more general context, like bond coupons and binomial trees.

Last edited by ASstudent; 04-23-2012 at 02:11 PM..
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Old 04-23-2012, 02:11 PM
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mlschop mlschop is offline
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I always use continuous, only because I was in the habit of using annual effective rate method, and would make some silly mistakes (like forgetting that the time steps in a binomial tree were x months instead of 1 year, and dividing by 1.05 instead of (1.05^(x/12)).

Using continuous kind of forces that t in my face and helps me remember not to make this stupid mistake.
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Old 04-23-2012, 02:18 PM
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Jereme Jereme is offline
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My impression is that if the question does not state what form they are in then we should just state our assumption and move on with the calculation.
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Old 04-25-2012, 12:39 PM
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PAK PAK is offline
Eddy Chan, FSA, CERA, MAAA
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If the question does not specify, either approach is fine.
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discounting, interest rate

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