This book addresses one of the enduring questions of democratic government: why do governments choose some public policies but not others? Political executives focus on a range of policy issues, such as the economy, social policy, and foreign policy, but they shift their priorities over time. Despite an extensive literature, it has proven surprisingly hard to explain policy prioritisation. To remedy this gap, this book offers a new approach called public policy investment: governments enhance their chances of getting re-elected by managing a portfolio of public policies and paying attention...