http://www.dailymail.co.uk/news/article-3308923/New-figures-reveal-Australian-families-pay-3000-year-GST-hiked-15-cent-speculation-grows-increase-tax.html
https://en.wikipedia.org/wiki/Goods_and_Services_Tax_(Australia)
https://en.wikipedia.org/wiki/Goods_and_Services_Tax_(Canada)
http://www.cra-arc.gc.ca/tx/bsnss/tpcs/gst-tps/gnrl/menu-eng.html
https://en.wikipedia.org/wiki/Goods_and_Services_Tax_(New_Zealand)
https://en.wikipedia.org/wiki/Value-added_tax#Different_systems