The Daily Chase: Investors optimistic on vaccine delivery, stimulus hopes Itâs shaping up to be a positive start to the trading week with a slew of factors stoking investor optimism. The worldâs most ambitious vaccination campaign is picking up momentum as the first batch of Pfizer-BioNTech doses against COVID-19 arrived in Canada yesterday evening and the U.S. Food and Drug Administration authorized emergency use late Friday. Meanwhile, hope is still alive for fiscal aid in the United States, with a US$908-billion bipartisan proposal expected to be unveiled today. And yet another Brexit-related deadline has come and gone as the U.K. and European Union agreed to extend trade talks beyond yesterdayâs deadline â which is propelling the British Pound higher today. But all of those are complicated files; how cautious should investors be about the risk of setbacks? Weâll gather insight from market professionals and medical experts.