By Dr Sam Perlo-Freeman • Today SIPRI estimated that global military expenditure in 2015 was $1676 billion, about 2.3% of the world’s total Gross Domestic Product (GDP). Such high levels of spending frequently raise concerns as to the ‘opportunity cost’ involved in military spending—the potential civilian uses of such resources that are lost. One way to put this in perspective is to compare it to social spending. Do governments spend as much money on healthcare, for example? We can also look at what else the money could achieve if it were put to other specific uses. In particular, how far would this money go towards achieving the UN’s Sustainable Development Goals (SDGs)? To compare spending on military and health expenditure worldwide, we need reliable data. For the military data, we use the latest figures from SIPRI’s military expenditure database. For the health data, we use the World Health Organization’s...