Five and a Half Trillion Złoty Later: The True Cost of War for Poland (defence24.com)

• Reconstruction cost: 5.5 trillion PLN
• 40% of fixed capital destroyed
• Brain drain and ecological contamination

"A Polish study estimates that a full-scale war with Russia would cost 5.5 trillion złoty in reconstruction, destroy 40% of fixed capital, push unemployment above 43%, collapse GDP by 55%, and drive inflation to 850%. It also warns of a brain drain of skilled workers and severe ecological contamination."