What it means
In textbook finance a company should accept every project with a positive net present value, meaning every project expected to be worth more than it costs. Real businesses rarely behave that way, because lenders impose limits, shareholders dislike dilution and management teams doubt their own ability to run twelve major projects at once.
Rationing comes in two flavours. Hard rationing is imposed from outside, usually by banks or investors unwilling to supply more funding, while soft rationing is self imposed, when a board caps the capital budget to keep debt low or to stop the business overreaching.
The practical consequence is that net present value alone stops being a sufficient ranking tool. A project with a $2,400,000 net present value that costs $4,000,000 is a better use of scarce money than one with the same value that costs $6,000,000, so the profitability index, which compares value created to cash consumed, becomes the sensible yardstick.
Ranking by profitability index gets you close to the best answer but not always to it, because projects come in lumps that may not fit the budget neatly. The reliable method is to rank by index, then test a few combinations that use the budget fully and compare their combined net present value.
Rationing also has costs that never appear in the model. Turning down genuinely valuable projects year after year is a signal that the funding constraint itself deserves attention, whether by raising equity, extending borrowing facilities or selling assets that earn less than the projects being refused.
In practice
Real-world examples.
Example
A regional bakery chain can fund only two of five proposed new sites this year because its bank has capped borrowing. It ranks the sites by value created per dollar of fit out cost rather than by expected revenue, and ends up choosing two smaller units over one flagship store.
Example
A hospital trust with a fixed equipment budget must choose between a new scanner, a theatre refurbishment and a pharmacy automation system. Because the automation project costs least and saves the most staff time per dollar spent, it is funded first even though the scanner is the more visible purchase.
Example
A private equity backed manufacturer imposes its own limit of $8,000,000 a year on capital spending to keep debt covenants comfortable. Divisional managers now compete for the budget with ranked business cases rather than each spending whatever they can justify.
Think of it
“Capital rationing is having more good opportunities than money-being forced to choose among them.
Formula
Calculation
Profitability index = present value of future cash inflows / initial investment, which is equivalent to (net present value + initial investment) / initial investment
A distribution business has a capital budget of $10,000,000 and four approved projects. Project A costs $4,000,000 with a net present value of $2,400,000, giving an index of ($2,400,000 + $4,000,000) / $4,000,000 = 1.60. Project B costs $3,000,000 with a net present value of $1,500,000, an index of 1.50. Project C costs $6,000,000 with a net present value of $2,100,000, an index of 1.35. Project D costs $3,000,000 with a net present value of $900,000, an index of 1.30.
Ranking gives A, B, C, D. Taking A and B uses $4,000,000 + $3,000,000 = $7,000,000 and leaves $3,000,000, which is not enough for C but exactly funds D. That package costs the full $10,000,000 and delivers $2,400,000 + $1,500,000 + $900,000 = $4,800,000 of value.
Testing the obvious alternatives confirms the choice: A plus C also uses $10,000,000 but delivers only $2,400,000 + $2,100,000 = $4,500,000, and B plus C uses $9,000,000 for $3,600,000. The A, B and D package wins by $300,000 over the next best option.Case study
Seen in the real world.
This is an illustrative, fictional example. Pellworth Foods, an invented mid sized producer, approved capital projects on a first come, first served basis until its budget ran out each spring. Divisions learned to submit requests in January regardless of quality, and by March the money was gone.
A new finance director introduced a single annual ranking, scoring every request by net present value per dollar of investment and publishing the league table internally. In the first year under the fictional system the same $10,000,000 budget funded projects with roughly $1,800,000 more combined value than the previous year's spending, simply because a large low ranking warehouse extension lost out to three smaller high ranking automation projects.
The unexpected benefit was behavioural. Once managers could see where their proposals sat in the ranking, they began reworking weak cases to cut costs rather than lobbying for special treatment.
Watch out
Common mistakes.
- Ranking projects by net present value alone under a budget constraint, which favours large projects that soak up cash without creating the most value per dollar.
- Treating the capital budget as a fixed law of nature rather than a decision, when the value being turned away may justify raising more funding.
- Ignoring that some projects are divisible or can be phased, so a smaller first stage might fit the budget and capture most of the value.
Questions
People also ask.
Is capital rationing a sign of poor management?
Not necessarily, since soft rationing is often a deliberate discipline that stops a business taking on more projects than it can execute well.
Does the profitability index always give the right answer?
It gives the right ranking for divisible projects, but with indivisible ones you should still test a few full budget combinations before committing.
What should be done with projects rejected under rationing?
Keep them in a ranked pipeline with refreshed numbers, because they are the natural first calls on next year's budget or on any unexpected funding.
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