The cost comparison starts with the ship being protected, including the years needed to replace it. An interceptor costing more than an incoming drone can still prevent a far larger loss. Cheap gun ammunition could improve that exchange where it can defeat the threat. The example uses a billion-pound asset and a replacement period of five or six years, while its spoken cost fractions are inconsistent. Replacement capacity belongs alongside the purchase price in the comparison.
Notable Point · 40:21-42:12
Measure defensive expenditure against the ship protected
The value and replacement time of a defended ship change the meaning of an expensive interception.