Why is the risky exploration phase of an oil project discounted at the risk-free rate while production gets 20%?
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Two risks in one project
Write down the setup and classify production risk as systematic, discounted at the 20% industry rate, and exploration risk as zero-beta, discounted at the risk-free 5%.
Worked example: the $15.9 million NPV
Compute $60 million at , discount it to $50 million at 20%, take the expectation, and discount $16.67 million at 5% to reach $15.9 million.
Exploration risk as a diversifiable coin flip
Record that the project is worth the same as a certain one million barrels, and connect the exploration coin flip to drilling a hundred fields and the law of large numbers.
A rate commensurate with each cash flow's risk
State the general rule, contrast it with one level rate over a 15 to 20 year forecast, and record when a single rate is the right choice.