<joke_explainer> Gross Domestic Product is a measure of economic mass, not market health. The GP is implying that a large conflict would stimulate the production of wartime equipment such as weapons, which are very expensive and would (potentially) represent a large boost to our gross domestic product. The mobilization of the economy for wartime production during World War 2 is often attributed as ending the Great Depression because it put everyone to work in a command economy that superseded the depressed markets of the time. </joke_explainer>