We show that sovereign debt impairments can have a significant effect on financial markets and real economies through a credit ratings channel. Specifically, we find that firms reduce their investment and reliance on credit markets due to a rising cost of debt capital following a sovereign rating downgrade. We identify these effects by exploiting exogenous variation in corporate ratings due to rating agencies' sovereign ceiling policies, which require that firms' ratings remain at or below the sovereign rating of their country of domicile.

for helpful suggestions. We also thank Shan Ge and Xi Wu for excellent research assistance. The views expressed herein are those of the authors and do not necessarily reflect the views of the National Bureau of Economic Research. NBER working papers are circulated for discussion and comment purposes. They have not been peerreviewed or been subject to the review by the NBER Board of Directors that accompanies official NBER publications.

Ensuring that a firm has sufficient liquidity to finance valuable projects that occur in the future is at the heart of the practice of financial management. However, although discussion of these issues goes back at least to Keynes (1936), a substantial literature on the ways in which firms manage liquidity has developed only recently. We argue that many of the key issues in liquidity management can be understood through the lens of a framework in which firms face financial constraints and wish to ensure efficient investment in the future. We present such a model and use it to survey many of the empirical findings on liquidity management. In addition, we discuss agencybased theories of liquidity, the real effects of liquidity choices, and the impact of the 2008-2009 Financial Crisis on firms' liquidity management.

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We exploit variation in demand induced by demographics to provide causal evidence of the precautionary motive of cash holdings. We show that firms significantly increase their cash levels in response to exogenous increases in investment opportunities. We also provide novel evidence of the dynamics of accumulation and use of cash. Financially constrained firms build their cash reserves using internal sources. Consequently, they start saving earlier and keep high cash levels longer. Unconstrained firms rely on external financing to both invest and build cash reserves, requiring them to save less and allowing them to incur lower costs of carry.