Tax Justice Network creator text Tax Justice Network 2011 monographic 20p. 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. iffoadatabase.trustafrica.org/iff/Cost_of_Tax_Abuse_TJN_Research_23rd_Nov_2011.pdf iffoadatabase.trustafrica.org/iff/Cost_of_Tax_Abuse_TJN_Research_23rd_Nov_2011.pdf