We discuss the internal organization of the firm, arguing that the com
parison between a centralized and a decentralized hierarchical organiz
ation should be cast in terms of the agency costs associated with the
different side-contracting games that agents play in these organizatio
ns. In our model, with no limits on communication between the agents a
nd the principal (complete contracting), collusion is not an issue in
a centralized organization. Centralization always dominates (at least
weakly) delegation. With limits on communication (incomplete contracti
ng), collusion may have some bite under centralization. Limits on comm
unication introduce an anonymity condition on the contract, creating a
conflict between participation and coalition incentive constraints un
der centralization. By shifting the bargaining power in the side-contr
acting stage, delegation is nonanonymous and asymmetric by design. Thi
s conflict is then avoided or diminished depending on the exact timing
of the delegation game.