I am often sent E-mails asking me to explain succinctly (what my other explanations are not!) how public deficits finance saving. What does it mean? How does it work in a macroeconomic system? What is the difference between automatic stabilisers and discretionary budget dynamics? What would have happened if the government had not have increased the growth in spending? All these sorts of questions. So this short blog – to make up for yesterday’s ridiculously long blog – will cover those issues. It should clear up any outstanding issues about why deficits are important to underwriting growth.