Thesis (Ph. D.)--Massachusetts Institute of Technology, Sloan School of Management, 2006."June, 2006."Includes bibliographical references.Chi: Subsidiary Debt, Capital Structure, and Internal Capital Markets I investigate external subsidiary debt financing and its implications for internal capital markets. I find that firms tend to finance business segments with subsidiary debt when those segments have better investment opportunities than the rest of the firm, and such debt tends to be parent-guaranteed. I also find that having such debt outstanding significantly reduces the effect of a segment's cash flow on the capital expenditures of other segments. These findings suggest that firms use subsidiary debt to protect their stronger segments ...