The socio-economic and cultural value of volunteering to Western Australia in 2015 is conservatively estimated to be $39.0 billion. This figure is much greater than previous estimates based on price or economic impact alone, yet is likely to be a significant underestimate given the limitations of the availabledata and analytic techniques.
The Economic, Social and Cultural Value of Volunteering to Western Australia
http://volunteeringwa.org.au/assets/downloads/vwa_report%20book_web.pdf