Why did world stocks hit record highs in 2020?

Financial markets. Coronavirus

The United States was the scene of the most surprising gains in 2020, with the Nasdaq technology index rising 42% and the S&P 500 index rising 15%.

But the UK’s FTSE 100 index, with its struggling oil companies, banks and airlines – all of which have been hit hard by the pandemic – was not so lucky.

in:

https://www.bbc.com/mundo/noticias-55536375

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Will the upward trend continue? …

  A common and frequent question that arises in economic training 
  in which I participate