The Cost of Tax Abuse: A Briefing Paper on the Cost of Tax Evasion Worldwide Tax Justice Network The report estimates the absolute size of a country’s shadow economy based upon its own published estimate of its GDP and recently reportedly data on the size of the shadow economies published by the World Bank. Tax Justice Network 2011 2011 Text 20p. iffoadatabase.trustafrica.org/iff/Cost_of_Tax_Abuse_TJN_Research_23rd_Nov_2011.pdf