即便是悲观的情景也表明，到2050年这一成本只会上升到1.8 % ； 而在乐观情境中，军事成本将进一步下降到GDP的1.6 % 。
Even a pessimistic outlook suggests an increase only to about 1.8% by 2050; under a more optimistic scenario, military costs could decline further, to 1.6% of GDP.