> Those interested with very low latency are not hedge funds but market makers, and the kind of microstructure signals they exploit is not only orthogonal to what a retail investor would do, but often brings in just bips per trade, meaning the leverage required to make it worth it is anyway out of the retail league.

Thanks for clarifying.

> What is a normal retail investor? Obviously hedge funds are going to be faster to react to e.g. earnings events than you. That doesn't mean this information is not public. It's just that HF pay data providers, invest in automatic data processing and decision making, etc.

Well, this is sort of what I'm saying. As a regular person, you just don't have the same information, or the ability to act on it as quickly. Sure, buy and hold investors aren't really affected, but they are providing liquidity for these folks who can take some advantage. I may be pretty wrong about this, however, it's just like anything where there are friends / contacts / associates. Some parties just have more information, especially if they have money to spend. You did mention earnings though. I just have a hard time believing that hedge funds only act on public information. They might structure their trades based on how not to get flagged, but how do they not have friends or contacts in the space that tell them a thing or two? This is what they are doing full time, so I would imagine they spend a good majority of their time thinking about how to make the most money and not raise any red flags. I actually don't have an issue with this, but I always see claims that the traditional market is totally fair, but it does not seem like a very flat system to me. Those in power seem to have some advantage. If that was how the market was presented (i.e. some people have sway, more information, and the ability to act more quickly than retail), I wouldn't have any issue with this. I see the opposite though, the narrative is that retail traders can make trades without worrying because it's totally equal. If all retail traders were doing was buy and hold, then again, no issue, but not all retail traders trade that way.

> Yes, what about them? The name triggers the imagination of people but there's really nothing fancy about it. The objective of dark pools is to allow the exchange of shares without too much of a movement in the orderbook. This is actually good for both users of dark pool (they get lower slippage) and users of the public market (it prevents artificial big swings in price due to large buyouts, which would be announced anyway). The liquidity at time T in the order book is not tailored to absorb any ridiculous amount that a large investor could be willing to exchange.

Where do I learn more about dark pools? My initial response to learning about them was that they are basically tailored to hide trades from the general public, for the benefit of institutional traders. I was concerned that dark pool operators would also have information that then they could front-run the rest of the market with. I feel like when I make a trade in the equity markets, or if I read something in traditional news, someone else has heard about this earlier that day, or maybe days before, based on insider information, just due to them being more deeply involved with the market. I just don't really see how this is fair (and this is the claim I see time and time again in traditional markets). I don't think all this information is public. If it's in some obscure place, that 95% of the investing public doesn't see, is it really public? Maybe the SEC protects against that, but it seems like the big players have an advantage. It seems like I have a lot of incorrect assumptions though, so I'd like to learn more about this.

> What exchanges do, though, is offer rebates to providers of liquidity (including the market makers that you seem to despise) in exchange for the liquidity they provide. This is not a random decision by the exchange, it's because providing liquidity to the market is beneficial for everyone. As an investor, it means I won't have to worry that I will not be able to sell my shares whenever I want to. It also means that the spread will be tighter, thus lowering my slippage. And subsequently, it also means arbitrage is most likely in place, so I'm not being scammed just because I didn't check the price on 5 different platforms.

Yeah, I get it, this is a quite mature market (and that's a good thing). I still have a feeling that the extremely powerful have sway in the market, in a way that isn't exactly "fair", but maybe it just comes down to the amount of capital they have (but again, I would think that the size of the trades should be on public markets then, not dark pools). Anyway, in the end, what I've learned from all this is how far the traditional markets have come, and how other markets (like crypto, which also have things like dark pools) can learn from this.