(1) Whether, in light of the recent dramatic decline in domestic demand, the National Treasury and/or SA Revenue Services (SARS) have conducted a study into and/or broadly considered reducing tax in a differentiated manner to stimulate the economy, either through reforms like those seen recently in the United Kingdom, Russia and Chile and/or by any other means; if not, why not; if so, what are the relevant details; (2) whether the National Treasury and/or SARS have calculated an updated estimated tax revenue shortfall figure for the financial year based on revenue collection trends for this year; if not, why not; if so, what are the relevant details?