Trading 101: How is a Stock's Price Determined?

I received this question from a YouTube follower, and despite it being potentially obvious to someone involved in the stock market for a longer period of time, it's a great and valid question. How exactly is a price of a stock determined? What goes into causing a stock price to fluctuate up and down in price? The good news is, the "how" and "what" is very straight forward.

The Ultimate Game: https://claytrader.com/videos/ultimate-game-stock-market/