In this article I identify a type of integration cost that is associat
ed with agency relations within the firm. This cost arises when the fi
rm's principal cannot fully commit to long-term contracts with the fir
m's agents, and these agents have private information. In the model, i
ntegration can lead to value enhancements through the realization of c
omplementarity gains. But this will also lend to larger rents, which i
s costly for the principal. I show that this type of cost may be suffi
ciently large to act as an effective limit for integrations that are o
therwise profitable.