Before you start: Read the business-case lesson; use consistent monetary units.
Try it
An option has positive NPV but a large cash shortfall before receipts arrive. Is it affordable?
Your reasoning, assumptions and units:
Apply it to your work
Describe a comparable situation. What evidence would you need before using this reasoning to make a decision?
Your example and next check:
Answer and reasoning
Positive NPV does not establish affordability. Inspect the cumulative cash plan and funding availability at each date, as well as the assumptions behind the discount rate and receipts.
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