The three essays in fiscal policy analyze the effects of government spending and taxes on the economy. They use a model to study how different fiscal policies impact things like house prices, income taxes, and public investments. The researchers found that increasing government spending and investments can stimulate the economy in the short term, while tax cuts and public investments have longer-term benefits. They also discovered that financial deregulation can affect how fiscal policies impact the economy, and that austerity measures can disproportionately affect those who are already struggling financially.