The 11 and 20 money is the budget (11k and 20k) so just by having that amount or more (earned by playing and completing missions), you can buy them. Factories will produce over time the "box" resources. What are box resources used for? Once you buy airbases (the same way) you can activate a new option when selecting a mission (Supply drop), which will spend the box resources after launching said mission and then drop you some goodies in the mission itself. Take into account that only missions inside the airbase radius are eligible for this option.
Agux
Agustin joined
This member has provided no bio about themself...