Plural governance: The effect of internal production on supplier performance

We suggest that both making and buying the same product or service has several effects on supplier performance. A model is developed and tested by use of answers gathered from the Danish municipalities. The results support the three hypotheses that (1) the negative effects of technological uncertainty on supplier performance decrease when buyers combine internal production and external sourcing, (2) the negative effects of performance uncertainty on supplier performance decrease when buyers combine internal production and external sourcing, and (3) the negative effects of asset specificity on supplier performance decrease when buyers combine internal production and external sourcing. However, the moderating effects depend on how the plurality is measured. The results indicate that internal production may facilitate effective governance of the relationships with external suppliers. Implications for research on make-or-buy decisions and for practice are also discussed.