Most of the commentary about the current COVID-19 induced economic challenges use either the 2008 global financial crisis (GFC) or the 1929 Great Depression (https://www.bbc.com/news/business-52236936) as reference points. The reference points most relate to; 1) the severity of the economic challenges and; b) the time it will take to recover from the current challenge, in relation to either 1929 or 2008.
In the outlook for the recovery period, it assumed that the recovery will either be in the form of V shape or an L Shape compared to previous recovery shapes.
The questions are as follows:
For ease of reference, see some of the links below
https://blog.euromonitor.com/global-economy-10-years-after-financial-crisis/
https://www.brookings.edu/research/10-years-after-the-financial-crisis-uneven-progress-and-some-structural-disconnects/
NB: The significance of the BBC reference is the quote (s) attributed to the MD of the International Monetary Fund (IMF).