"This Economic Outlook presents two equally likely scenarios for each country and economy – one scenario in which a second outbreak occurs in all economies towards the end of this year (Table 1.1, Panel A) and an alternative scenario where the second outbreak is avoided (Table 1.1, Panel B). In the “double-hit” scenario, global GDP is projected to decline by 7.6% this year and remain well short of its pre-crisis level at the end of 2021; in the “single-hit” scenario, world GDP is projected to decline by 6% this year, but will have almost regained the pre-crisis level at the end of 2021. Even so, in many advanced economies, the equivalent of five years or more of per capita real income growth could be lost by 2021."