Essays on production networks and macroeconomics

Modern economies consist of complex production networks, where specialised producers rely on intermediate inputs from their suppliers to produce outputs consumed by their customers. This thesis explores how these networks shape micro- and macroeconomic outcomes. Chapter 1 introduces a new measure of producers' systemic importance, capturing the aggregate impact of microeconomic supply and demand shocks that propagate through (in)direct customers and suppliers. Chapter 2 examines whether industries highly exposed to microeconomic shocks from other industries face greater output volatility. Finally, Chapter 3 develops a general framework for aggregating network spillover effects in multisector models with production networks.