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The demand for more military spending is based on a somewhat arbitrary 2 percent of GDP. For those interested, here is a link to the past spending of NATO countries as a percent of GDP and in total spending.
Defense Spending of NATO Countries
Is the 2 percent number realistic? Maybe it should be more about 1 percent. At 2 percent, countries like Germany, Netherlands, and Demark would have to increase expenditures by 80 percent. Canada would have to double its expenditures.
Dutch makes a good point about how a country could increase expenditures. The obvious answer is buy more military equipment. For the United States, a major exporter in increasingly expensive military equipment, it would be good for our country and jobs. It's one way Trump can meet his campaign promise to create jobs. Last year's model of a tank is obsolete? Buy the newest model every year with it's latest electronic gadgetry. The old can go to the military graveyard.
Do we really fear an invasion or attack by Russia or China or North Korea or Iran or ISIS? I hardly think so. But that's the fear that helps sell military expenditures. In a way it is no different than the fear mongering that goes on by the NRA and gun manufacturers to get you to buy more guns. Maybe one day every family in America will be required to spend so much money as a percent of their family income on home defense. Ha.