A primer on what you need to know about short selling as an army of amateur investors battles it out against hedge funds.

Special purpose acquisition companies, or SPACs, are exploding in popularity. They allow companies to go public without all the hoops of an initial public offering.

Markets welcomed President Trump's recommendation the transition process begin, which will provide critical resources and information to President-elect Joe Biden's team.

Investors were also reassured by comments from two Biden advisers that no nationwide COVID-19 lockdowns are being contemplated.

Stocks surged after Pfizer said its experimental vaccine was more than 90% effective and after former Vice President Joe Biden was elected president.

Stocks have traditionally done well with a Democrat in the White House and Congress under Republican control.

The Dow tumbled more than 900 points as COVID-19 cases surge in the United States and Europe, while next week's election is only adding to the uncertainty over the economy.

If the electric carmaker enters the S&P 500 index, as is widely expected, Wall Street's most controversial stock would start appearing in even the most mainstream investment accounts.