Why does the profitability index always agree with NPV on accept or reject, yet pick the wrong one of two rival projects?
Loading…
Profitability index
Define PV as the present value of the flows from onward, state both decision rules, and derive from .
Ranking mutually exclusive projects: PI ignores scale
Work a pair of projects of your own in which the higher-PI project has the lower NPV, and record that NPV in dollars is the ranking criterion.
PI under capital rationing
State that ranking by PI ranks by NPV per dollar, which maximises total NPV only for divisible projects under a single budget limit, and give a whole-project example where it picks the wrong set.
The hidden assumption behind working in returns
Record that returns give one theory for every investor by assuming any amount earns the same return, and contrast an emerging sector with a capacity-constrained strategy where that assumption fails.