A vast increased in defense spending in recent years may be attributed to what events for changes

A vast increase in military spending can be attributed to the War on Terror (post 9/11) and the continued conflicts in Iraq and Afghanistan. The Syrian Civil War has also been a source of concern. Military spending can also be linked to anti-terror activities around the world.

"choosing is refusing" means individuals face an opportunity cost with each decision they make. economists state that every decision involves trade-offs. opportunity cost is the least desirable alternative given up as a result of a decision.