No, it is a original screenplay written by American screenwriters Stanley Weiser and Oliver Stone (who also directed the movie). It was followed by a sequel, Wall Street: Money Never Sleeps (2010) in 2010.

Gordon Gekko is the film's corporate villain who attempts to and succeeds in corrupting young stock trader Bud Fox. His famous "Greed is Good" speech is a highlight of the film showcasing his "wolf in sheep's clothing" persona. Though he's in the business of buying out large companies, Gordon got his start in real estate.

Yes and no. What Gordon actually said was "Greed, for lack of a better word, is good." Gordon continues: Greed is right. Greed works. Greed clarifies, cuts through and captures the essence of the evolutionary spirit. Greed in all of its forms—greed for life, for money, for love, knowledge—has marked the upward surge of mankind and greed, you mark my words, will not only save Teldar Paper, but that other malfunctioning corporation called the USA.

Bud worships Gordon and wishes to be like him. At the beginning of the film Bud tries to honestly get Gekko's attention by showing him his stock picks, but Gordon is not impressed with Bud's knowledge. Sensing this, Bud recommends Bluestar Airlines to Gekko because he knows that the airline is about to win a court case regarding an accident that was not the airline's fault. (This gives Gekko a day's lead-time to buy some stock before the ruling is made public and the stock price rises.) At this point in the film Bud starts to follow the path that Gordon will ultimately set him on. Bud's revelation to Gekko about Bluestar is an illegal practice called insider trading, where someone discovers or searches for and reveals information that's not been made public to investors so they can exploit the company's financial offerings.

It's the first handheld cellular phone in widespread use called the DynaTac, it's one of the 8000 series of phones. Cellular phones did exist long before the 1980s but the private handheld ones didn't come out until the early '80s. Dr. Martin Cooper led the team that developed the phone. The phone was nicknamed "the brick" by users because of its large size and weight. Since the technology hadn't taken off yet like it did at the beginning of the 21st Century, phones like this were only used by the rich who could afford them. In the ensuing 12 or 13 years between the time this film was released and the year 2000, the technology was pared down so mobile phones became more compact and much more advanced.

Incidentally, the first phone call made with a cellular unit was done in 1973, so the tech existed in 1985, it just wasn't widespread and only available to those who could afford it.

At the end of the film we are never told what happens to Bud and Gordon. We are left to wonder if Gekko received a long jail sentence and Bud received either no jail time or a short one for collaborating with the SEC (Securities and Exchange Commission) and the police against Gordon. The 2010 sequel "Wall Street: Money Never Sleeps" tells us that Gordon served a sentance of "almost 8 years" for the insider trading he committed in the original Wall Street film. We are never told if Bud Fox received any jail time - but the two meet, and Bud mentions "some time away," so it can be assumed that he was sentenced to prison.

Bud Fox is the main hero of the story who is corrupted by Gordon Gekko but eventually redeems himself. Bud is a stockbroker for Jackson-Steinem and is looking to make it to the top. Carl Fox is Bud's father who is a union leader and blue collar machinist for Bluestar Airline. Carl is the complete opposite of Gordon Gekko and is not fooled by Gordon's act. Carl doesn't approve of Bud's association with Gekko and the way his son is living his life.