This doctoral thesis consists of three chapters looking at aspects of corporate saving. It touches on issues relevant to public, monetary, and international economics. The first two chapters look at the US economy. Chapter I looks at rising corporate profits and shows they are associated with weak capital demand and rising saving by high-income households. Chapter II explores how industry concentration affects the transmission of macroeconomic shocks and monetary policy. Both chapters establish novel empirical findings based on micro-level data and develop consistent theoretical frameworks allowing for counterfactual policy analysis. Chapter III looks at the global minimum tax on large multinational enterprises and evaluates the reform’s scope and potential scale. It has an empirical focus and addresses information gaps critical to policymakers. Again, it uses novel, micro-level data to ground its findings.