MAKE OR BUY DECISIONS UNDER LIMITING FACTORS
One reason for buying products/services from another organisation is the scarcity of resources, so that the company may be unable to make all its components. In such a case the company should combine internal resources with buying externally to increase profitability. In situations where a company must sub-contract work to make up short fall in its in-house capability, then its cost will be minimized where the marginal cost of buying is least for each unit of scarce resource saved by buying externally.