This thesis makes a contribution to network theory and how it applies to economics. It consists of three self-contained papers. It predominantly considers how connections between economic entities can affect economic outcomes. In particular, the first two papers examine social learning, in the one case by applying it to portfolio choice, and in the other by conducting an experiment to determine how people incorporate information from others into their beliefs to achieve economic outcomes. The final paper looks at how sectoral shocks can be transmitted through the economy through the connections between industries.