Trading large volumes with penny profits per share
How do you know the shares will go up after you buy? The ultimate risk in your scenario is that you buy at a peak, and then that peak is never reached again. Over time, stock markets go up [more or less because there is a net increase in the overall production of the economy as time goes on]. However, you won't experience much of that gain, because you will be selling only after tiny amounts of profit have been achieved. So your upside is low, your plan is capital-expensive [because it requires you to have significant amount of cash available to make the initial purchase], and your downside [though unlikely] has massive risk. Currently my online savings account pays an interest rate of 1.25%.  With 100K, I can earn about $104 per month in that account.  No risk, no timing, no fuss. So in theory you can make money by small changes in the valuations of stock.  However there are often better, risk free options for your money; or, there are much better options for returns with much less risk, but more than that of a bank account.
"That's like a car dealer advertising their ""huge access"" to Chevrolet.  All brokers utilize dark pools nowadays, either their own or one belonging to a larger financial institution.  Why?  Because that's a primary source of broker income.  Example: Under current US regulations the broker is under no obligation to pass these orders to actual (a.k.a. lit) exchanges.  Instead it can internalize them in its dark pool as long as it ""improves the price"".  So: If a broker doesn't run its own dark pool, then it sends the orders to the dark pool run by a larger institution (JPMorgan, Credit Suisse, Getco, Knight Capital) and gets some fraction of the dark pool's profit in return. Are Mom and Pop negatively impacted by this?  Not for most order types.  They each even got a free penny out of the deal!  But if there were no dark pools, that $1.00 difference between their trade prices would have gone half ($0.50) to Mom's counterparty and half ($0.50) to Pop's counterparty, who could be someone else's Mom and someone else's Pop. So ... that's why brokers all use dark pools, and why their advertisement of their dark pool access is silly.  They're basically saying, ""We're going to occasionally throw you a free penny while making 49 times that much from you""! (Note: Now apply the above math to a less liquid product than AAPL.  Say, where the spread is not $0.01, but more like $0.05.  Now Mom and Pop still might make a penny each, while the broker can make $4.98 on a 100 share trade!)" There is a misunderstanding somewhere that your question didn't illuminate. You should have lost $0.04 as you say. Assuming the prices are correct the missing $0.02 aren't covered by a reasonable interpretations of the Robinhood fees schedule. For US-listed stocks: $0 plus SEC fees: 0.00221% of principal ($22.10 per $1,000,000 of principal) plus Trading Activity Fee: $0.000119/share rounded to nearest penny plus short/long term capital gains taxes The total fee rate is 0.002329% or 0.00002329*the price of the trade. With you trades totaling around $11, the fee would be ~0.000256 or ~1/40 of a penny.  The answer is probably that they charge $0.01 for any fraction of a penny. It's difficult to explain as anything other than avarice, so I won't try. "You can certainly try to do this, but it's risky and very expensive. Consider a simplified example. You buy 1000 shares of ABC at $1.00 each, with the intention of selling them all when the price reaches $1.01. Rinse and repeat, right? You might think the example above will net you a tidy $10 profit. But you have to factor in trade commissions. Most brokerages are going to charge you per trade. Fidelity for example, want $4.95 per trade; that's for both the buying and the selling. So your 1000 shares actually cost you $1004.95, and then when you sell them for $1.01 each, they take their $4.95 fee again, leaving you with a measly $1.10 in profit. Meanwhile, your entire $1000 stake was at risk of never making ANY profit - you may have been unlucky enough to buy at the stock's peak price before a slow (or even fast) decline towards eventual bankruptcy.  The other problem with this is that you need a stock that is both stable and volatile at the same time. You need the volatility to ensure the price keeps swinging between your buy and sell thresholds, over and over again. You need stability to ensure it doesn't move well away from those thresholds altogether. If it doesn't have this weird stable-volatility thing, then you are shooting yourself in the foot by not holding the stock for longer: why sell for $1.01 if it goes up to $1.10 ten minutes later? Why buy for $1.00 when it keeps dropping to $0.95 ten minutes later? Your strategy means you are always taking the smallest possible profit, for the same amount of risk. Another method might be to only trade each stock once, and hope that you never pick a loser. Perhaps look for something that has been steadily climbing in price, buy, make your tiny profit, then move on to the next company. However you still have the risk of buying something at it's peak price and being in for an awfully long wait before you can cash out (if ever). And if all that wasn't enough to put you off, brokerages have special rules for ""frequent traders"" that just make it all the more complicated. Not worth the hassle IMO." Some economist please ELI5 what I’m missing here. In the equities market, it is considered an economic benefit when exchanges settle trades in smaller increments. When we went from eighths to decimal, for example. How is that direction into smaller divisible units different from facilitating trade with pennies for economic goods? Nominal. What you say is true, but I'm guessing it would be too complicated to modelate. Plus, a shareholder of a very large company would not necessarily experience said loss if he/she sells the stock in small chunks at a time. "This is a classic correlation does not imply causation situation.  There are (at least) three issues at play in this question: If you are swing- or day-trading then the first and second issues can definitely affect your trading.  A higher-price, higher-volume stock will have smaller (percentage) volatility fluctuations within a very small period of time. However, in general, and especially when holding any position for any period of time during which unknowns can become known (such as Netflix's customer-loss announcement) it is a mistake to feel ""safe"" based on price alone. When considering longer-term investments (even weeks or months), and if you were to compare penny stocks with blue chip stocks, you still might find more ""stability"" in the higher value stocks.  This is a correlation alone — in other words, a stable, reliable stock probably has a (relatively) high price but a high price does not mean it's reliable. As Joe said, the stock of any company that is exposed to significant risks can drop (or rise) by large amounts suddenly, and it is common for blue-chip stocks to move significantly in a period of months as changes in the market or the company itself manifest themselves. The last thing to remember when you are looking at raw dollar amounts is to remember to look at shares outstanding.  Netflix has a price of $79 to Ford's $12; yet Ford has a larger market cap because there are nearly 4 billion shares compared to Netflix's 52m." You want to sell for 61.15, but the most the best buyer will pay is 61.10? The HFT trader forces you both to trade over a gap of a nickel AND makes a nickel in profit??      How does he do that, with magic? "ycharts.com has ""Weighted Average PE Ratio"" and a bunch of other metrics that are meant to correspond to well known stock metrics.  Other websites will have similar ratios." I've never heard of such a thing, but seems like if such a product existed it would be easily manipulated by the big trading firms - simply bet that trading volume will go up, then furiously buy and sell shares yourself to artificially drive up the volume. The fact that it would be so easily manipulated makes me think that no such product exists, but I could be wrong. I wouldn't recommend leveraged dividend fishing. Dividend stocks with such high dividends are highly volatile, you will run out of collateral to cover your trades very quickly That's up to you. If you instruct your broker to sell shares purchased in specific lots, they can do that -- but doing so requires that you and/or they track specific fractional lots forever afterwards so you know what is still there to be sold. FIFO simplifies the bookkeeping. And I am not convinced selecting specific lots makes much difference; the government gets its share of your profits sooner or later. No, at least not noticeably so. The majority of what HFT does is to take advantage of the fact that there is a spread between buy and sell orders on the exchange, and to instantly fill both orders, gaining relatively risk-free profit from some inherent inefficiencies in how the market prices stocks. The end result is that intraday trading of the non-HFT nature, as well as speculative short-term trading will be less profitable, since HFT will cause the buy/sell spread to be closer than it would otherwise be. Buying and holding will be (largely) unaffected since the spread that HFT takes advantage of is miniscule compared to the gains a stock will experience over time.  For example, when you go to buy shares intending to hold them for a long time, the HFT might cost you say, 1 to 2 cents per share. When you go to sell the share, HFT might cost you the same again. But, if you held it for a long time, the share might have doubled or tripled in value over the time you held it, so the overall effect of that 2-4 cents per share lost from HFT is negligible. However, since the HFT is doing this millions of times per day, that 1 cent (or more commonly a fraction of a cent) adds up to HFTs making millions. Individually it doesn't affect anyone that much, but collectively it represents a huge loss of value, and whether this is acceptable or not is still a subject of much debate! "One practical application would be to protect yourself from a ""flash crash"" type scenario where a stock suddenly plunges down to a penny due to transient market glitches. If you had a stop-loss order that executed at a penny (for a non-penny stock) it would be probably be voided by the exchange, but you might not want to take that risk." Large volume just means a lot of market participants believe they know where the stock price will be (after some amount of time).  The fact that the price is not moving just means that about 50% of those really confident traders think the stock will be moving up, and about 50% of those really confident traders think the stock will be moving down. I think if you are only trading stocks with average volume greater than 1M you should not have any trouble entering a 10,000 size trade. If you are you can try a couple of things: Change your order from a market order to a limit order, however this may potentially reduce the number of shares that are actually traded on that day, and you may miss out on some or all of your order. Limit your trading to more liquid stocks, say average daily volumes above 10M or 100M. Apart from that you might have to just put up with some extra slippage and incorporate it into your trading plan. That is you can reduce your R multiple to allow some slippage.