Book excerpt: "Once equity has fallen below a certain threshold for a significant period of time, it triggers a suspension of debt payments and distorts incentives for equity holds and managers. But what is a significant period of time? You or I could pay a $10 million annual mortgage payment for a day or two but not two or three months. Similarly, owners and managers can withstand short periods of illiquidity or negative equity but not longer ones. At some point in time, the inability to meet obligations and perception of continued difficulties creates a system-wide breakdown in debt payments." The relationship between the corporate sector and a country's macroeconomy is receiving increased attention from policymakers and investors, especially those affected by the Asian crisis. Recent crises have pointed out the importance of improving our understanding of the links between the corporate sector, the financial sector, and the macroeconomy in a world of volatile capital flows. Assessing the vulnerability of the corporate sector and its links to financial and exchange rate crisis is important for both improved surveillance and in the design of policies in crisis countries. However, the analytical and operational tools available to policymakers and investors to analyze this problem have been limited. This Technical Paper was prepared as part of an initiative to develop new frameworks which can integrate state-of-the art corporate finance principles, macroeconomic, and financial sector analysis. An innovative yet practical framework is provided which has numerous applications for assessing corporate sector vulnerability, design of corporate restructuring strategies, as well as financial sector and macroeconomic policies. It will be of interest to bankers, economic policymakers, corporate finance specialists, and macroeconomists.