No, 'Billions' is mostly a creation of the writers' imagination. It weaves a compelling narrative but doesn't draw from a single real-life account. However, it might incorporate common themes and scenarios found in the business world.
The Black Monday event was a financial nightmare. In terms of the true story for a Showtime related thing, it starts with the economic climate of the mid - 1980s. There was a boom in the stock market, and investors were very bullish. However, things started to turn sour. There were concerns about the U.S. trade deficit, and computer - based trading models that were new at the time exacerbated the selling. As stocks started to fall, it triggered a cascade of sell - offs. This led to the biggest single - day percentage drop in the history of the Dow Jones Industrial Average, and that's the real - life drama that a Showtime story could be centered around.
I'm not entirely sure specifically what 'Showtime 1996 Bedtime Stories' is about. It could be a collection of bedtime stories presented in 1996 on Showtime. Maybe it features various fictional tales for kids to listen to before going to sleep.
To be honest, I don't have a definite answer. Sometimes shows take elements from real life and fictionalize them. It's hard to say for this one without more information.