I had posted this on the politics thread but it may be of some use here.
The economic modelling presented in this report suggests that closing the gap between labour market participation rates and unemployment rates for people with and without diabilities by one third would result in a cumulative $43 billion increase in Australia's GDP over the next decade in real dollar terms.
Deloitte Access Economics
The economic benefits of Increasing employment for people with disability http://www.and.org.au/data/Conference/DAE_Report_8May.pdf
Im a bit of a Marc Faber fan,one of his all time quotes for me is," you only get 100 percent productivety with 100 percent employment"