Book excerpt: Recognising the regained importance of fiscal policy over the last two decades, this timely book provides much-needed insight into the changing practice of fiscal policy and how it is adapting to the unpredictable nature of the 21st century. Expert academic and practitioner contributors consider the resources which underpin current fiscal policy, assessing its overall effectiveness before outlining the changing priorities –ageing, inequality, climate change- and the financial tools available, and considering the future of fiscal policy in uncertain times.