This chapter outlines the theoretical framework of the financial statecraft of borrowers, drawing on bargaining frameworks to develop expectations for how a diversified portfolio of external finance enhances a country's leverage in aid negotiations with traditional donors. The chapter begins with donors' and recipients' preferences in negotiations, highlighting that donors have strategic and institutional reasons to provide development assistance, which leads them to compete in a marketplace for aid. When recipient countries diversify their portfolios of external finance, this diminishes their reliance on traditional donors and donors risk losing influence, in turn encouraging donors to provide more attractive aid. However, recipients vary in their ability to exploit this leverage, which depends on their strategic significance to donors and donor trust in their credibility.