This dissertation attempts to explain several firm corporate choices under the classical framework of contractual agency problems in corporate finance. Essay 1 examine firms’ debt maturity structure following exogenous changes in growth opportunities due to the COVID-19 shock. I Find companies experiencing an increase in growth options choose longer-term debt, a result that supports the arguments presented by Diamond and He, 2014 and Childs et al., 2005. Essay 2 examine the effect of firm’s risk exposure concentration on debt maturity choices. We find shortterm debt is preferred over covenants in mitigating debt-related agency problems of risk-shifting. These results indicate that maintaining future investment flexibility is important for f...