Lost productivity in the United States as a result of labour non-participation is significant: $120 billion (or 0.9 per cent of GDP) in 2011, amounting to 62 per cent of all drug-related costs. Similar studies in Australia and Canada identified losses of 0.3 per cent of GDP and 0.4 per cent of GDP, respectively. In those two countries, the cost of lost productivity was estimated to be 8 and 3 times higher, respectively, than health-related costs due to morbidity, ambulatory care, physician visits and other related consequences.