It depends on how you define 'real'. If by real you mean inspired by actual events or economic situations, then yes. But if you expect it to be a verbatim account of a specific incident, it might not be.
Black Monday, which occurred on October 19, 1987, was a major global stock market crash. Stock markets around the world plummeted. In the United States, the Dow Jones Industrial Average dropped by a staggering 22.6% in a single day. There were multiple factors contributing to it. Program trading was one factor, where computers were set to sell stocks automatically when certain market conditions were met. Also, there were concerns about the overvaluation of stocks and rising interest rates at that time.
Partially. The show takes elements from real financial incidents but fictionalizes and dramatizes them for entertainment purposes. So, it's a blend of truth and creative storytelling.