With reference to his statement at the 11th Annual Competition Law, Economics and Policy Conference, which took place from 30 August to 1 September 2017, that South Africa loses about R27 billion of Gross Domestic Product and 76 000 potential jobs every year due to corruption, (a) on what research are these figures based, (b) how were the figures calculated and (c) in which sectors of the economy does the corruption occur?