system
Given the following post, respond as if you're commenting on Reddit:
human
If someone found a way to "beat the market" would it break the market?

Imagine hypothetically some kid in his mom's basement finds a stock chart pattern that he can predict with 98% accuracy, regardless of the stock or market conditions. He tests it over and over. He starts making money. He tells some friends, who also start making money. The success rate of this trading tactic is so high, that it spreads until some colleges perform studies on it. It gets published in a few journals. It becomes more and more popular. Retail investors are using this tactic to great success and eventually institutional investors start using it.  

If everyone was now trading the same things every day, doing the same activity, what would happen to the market as a whole, and to the economy at large?
gpt
The market is a literal market place; there are buyers and sellers. In your hypothetical scenario, who would buy or sell on the opposite side of those winning trades, if everyone knew the system? Would you buy a stock that you knew was going to go down in value? Would you sell a stock if you knew it would go up?