Figure A D.1 displays the projected change in real exports and real GDP for the four scenarios with the three types of costs (trade costs, WTP, and data management costs) entered one at a time. In Scenario A No data localisation, there is a small contribution of trade cost reductions, because the interaction of data flow and data localisation policies on trade costs is considered. Lifting data localisation policies would for some regions with less restrictive data flow policies imply a reduction in the costs of transferring data and thus an expansion of trade. At the global level the impact is marginal, because this only happens in isolated cases. The contribution of WTP/trust is larger to the expansion of real GDP and real exports, since the isolated regions would move to a safeguards regime with higher levels of trust when restrictive data localisation policies are lifted.
Under Scenario B trade costs also fall and WTP/trust rises for regions and sectors with prohibitive data localisation policies but without ad hoc authorisation data flow policies. Hence, real GDP and exports are projected to increases because changes in trade costs and WTP/trust. However, the impact of reduced data management costs is small for the reasons described in the main text, i.e. the share of data management costs in total costs is small and the projected change in costs according to the BQ is small. Therefore, the overall projected change in GDP and trade is positive. Under Scenario C the largest contribution comes again from changes in trade costs and WTP/trust, because of the interaction of data flow and data localisation policies. The introduction of sectoral storage and flow prohibitions implies that in the concerned sectors data cannot be transferred anymore thus generating higher trade costs and reduced WTP/trust. Although only visible in the figure for real GDP and not for real exports because the impact is too small on the latter variable, there is an increase in data management costs thus generating larger reductions in real GDP and real exports. Finally, under Scenario D the effects are very similar to Scenario 4, because with a complete prohibition data flow and data localisation policies work out almost equivalently. The only difference is that under Scenario D also data localisation policies increase thus generating larger reductions in real exports and real GDP.