How much did WWI cost the world?

World War I is estimated to have cost around $350 billion in 1914 dollars, which translates to over $4 trillion when adjusted for inflation. This figure includes military expenditures, infrastructure damage, and economic disruptions across the involved nations. Additionally, the war resulted in significant human costs, with millions of military and civilian casualties, which had lasting social and economic implications for decades. The financial burden contributed to economic instability and set the stage for future conflicts, including World War II.