Opportunity cost.

Жаль, что у нас президентом сейчас мудозвон. После его недавней поездки страны Юго-Восточной Азии решили ориентироваться на Китай.

Technology as an arrow

Here's a good illustration of how old guns map to new ones. For the right model we should represent it as a functor between two worlds, e.g. to take into account the increase in population density, which makes automatic weapons even deadlier. I have a feeling it would be a good case for an adjoint.



upd: mass-produced automatic weapons created a military technology revolution that resulted in millions of death in WWI.