Suppose I a (hypothetical) very low frequency value based trader buy a million dollars worth of Apple. Apple should go up in price slightly, because someone (m

Suppose I a (hypothetical) very low frequency value based trader buy a million dollars worth of Apple. Apple should go up in price slightly, because someone (me) just made a big bet that it's going to do well. The market does this automatically. TSMC should also go up in price very slightly, because Apple doing well makes it more likely that TSMC (a major vendor of theirs) will also do well, and the market just learned that Apple is slightly more likely to do well, so it also just learned that TSMC is more likely to do well. In other words the companies performance is correlated, so the stock prices should be as well. By my understanding HFT is the mechanism by which the market can make TSMC go up slightly as well. High frequency traders can react to the information that apple is going to do better (as per it's increased stock price) and buy a bit of TSMC. This seems like it should make the market more accurate, and if you buy that the market accurately assigning values to a company is a good thing, seems like a good thing.