In 1916, the DOW Industrial (one of the 3 main US Market Indexes) surpassed 100 points. Many believed we were in a bubble that was ready to burst.
Today, the DOW is ~22,000.
*Journalist Charles Dow created the first index more than 100 years ago. In 1896, Charles averaged the stock prices of the top 12 publicly-traded companies by adding their stock prices together and dividing by 12.