super confused about bid and ask size. help
In the stock market many participants enter orders that are not necessarily set at the current market price of the stock (i.e. they are not market orders, they are limit orders). They can be lower than the market price (if they want to buy) or they can be higher than the market price (if they want to sell). The set of orders at each point of time for a security is called the order book. The lowest selling price of the order book is the offer or ask, the higher buying price is the bid. The more liquid is a security, the more orders will be in the order book, and the narrower will be the bid-ask spread. The depth of the order book is the number of units that the order book can absorb in any direction (buy or sell). As an example: imagine I want to buy 100 units at the lowest offer, but the size of the lowest offer is only 50 units, and there is not any further order, that means the stock has little depth. The principle of demand-supply law will not work if spoofing (or layering, fake order) is implemented. However, spoofing stocks is an illegal criminal practice  monitored by SEC. In stock market, aggressive buyer are willing to pay for a higher ask price pushing the price higher even if ask size is considerably larger than bid size, especially when high growth potential with time is expected. Larger bids may attract more buyers, further perpetuating a price increase (positive pile-on effect). Aggressive sellers are willing to accept a lower bid price pushing the price lower even if ask size is considerably smaller than bid size, when a negative situation is expected. Larger asks may attract more sellers, further perpetuating a price fall (negative pile-on effect).  Moreover, seller and buyers considers not only price but also size of shares in their decision-making process, along with marker order and/or limit order. Unlike limit order, market order is not recorded in bid/ask size. Market order, but not limit order, immediately affects the price direction. Thus, ask/bid sizes alone do not give enough information on price direction. If stocks are being sold continuously at the bid price, this could be the beginning of a downward trend; if stocks are being sold continuously at the ask price, this could be the beginning of a upward trend.  This is because ask price is always higher than bid price. In all the cases, both buyers and sellers hope to make a profit in a long-term and short-term view yes you are right as per my understanding while doing trade you must consider fol (specially for starters like me) The volume of the stock you are trading in should be high enough to keep you secure for quick in and out Whenever the bid volume is more than the ask volume the prices will move up and vice versa. to give an example if a stock is at 100 points and there are fol bids: The transaction will occur when either the bidder agrees to pay the ask price (case 1. he pays 101 . his bid offer will disappear and the next best ask will be 102. and the current price will be 101 which was the last transaction.) or when the person giving ask price agrees to deal at best bid which was 99 in which case the share will go down.
"The answer posted by Kirill Fuchs is incorrect according to my series 65 text book and practice question answers. The everyday investor buys at the ask and sells at the bid but the market maker does the opposite. THE MARKET MAKER ""BUYS AT THE BID AND SELLS AT THE ASK"", he makes a profit form the spread. I have posted a quiz question and the answer created by the Financial Industry Regulatory Authority (FINRA). To fill a customer buy order for 800 WXYZ shares, your firm requests a quote from a market maker. The response is ""bid 15, ask 15.25."" If the order is placed, the market maker must sell: A)   800 shares at $15.25 per share. B)   800 shares at $15 per share. C)   100 shares at $15.25 per share. D)   800 shares at no more than $15 per share. Your answer, sell 800 shares at $15.25 per share., was correct!. A market maker is responsible for honoring a firm quote. If no size is requested by the inquiring trader, a quote is firm for 100 shares. In this example, the trader requested an 800-share quote, so the market maker is responsible for selling 8 round lots of 100 shares at the ask price of $15.25 per share." "Stock prices are set by bidding. In principle, a seller will say, ""I want $80."" If he can't find anyone willing to buy at that price, he'll either decide not to sell after all, or he'll lower his price. Likewise, a buyer will say, ""I'll pay $70."" If he can't find anyone willing to pay that price, he'll either decide not to buy or he'll increase his price. For most stocks there are many buyers and many sellers all the time, so there's a constant interplay. The typical small investor has VERY little control of the price. You say, ""I want to buy 10 shares of XYZ Corporation and my maximum price is $20."" If the current trending price is below $20, your broker will buy it for you. If not, he won't. You normally have some time limit on the order, so if the price falls within your range within that time period, your broker will buy. That is, your choice is basically to buy or not buy, or sell or not sell, at the current price. You have little opportunity to really negotiate a better price. If you have a significant percentage of a company's total stock, different story. In real life, most stocks are being traded constantly, so buyers and sellers both have a pretty good idea of the current price. If the last sale was ten minutes ago for $20, it's unlikely anyone's going to now bid $100. They're going to bid $20.50 or $19.25 or some such. If the last sale was for $20 and your broker really came to the floor and offered to buy for $100, I suppose someone would sell to him very quickly before he realized what an outrageous price this was. I use TD Ameritrade, and on their web site, if I give a price limit on a buy that's more than a small percentage above the last sale, they reject it as an error. I forget the exact number but they won't even accept a bid of $80 if the stock is going for $40. They might accept $41 or $42, something like that." Ya, that's a lot of data - especially considering your relative lack of experience and the likely fact that you have no idea what to do with what you're given.  How do you even know you need minute or tick-based bid-ask data?    You can get a lot more than OHLC/V/Split/Dividend.  You can get:  * Book Value; * Dividend information (Amount, yield, ex date, pay date); * EBITDA; * EPS (current AND estimates); * Price/sales ratio; * Price/book value; * Price/earnings ratio; * PEG ratio; * Short ratio; * Market cap.  Among other things, all for free. The market maker will always compare the highest bid and the lowest ask. A trade will happen if the highest bid is at least as high as the lowest ask. Adding one share (or a million shares) at a higher asking price, here: $210 instead of $200, will not have any effect at all. Nobody will buy the share.  Adding a bid for one share (or a million shares) at a higher bid price will trigger a sale. If you bid $210 for one share, you will pay $210 for one of the shares that were offered at $200. If you have $210 million in cash and add a bid for 1,000,000 AAPL at $210, you will pay $210 for all shares with an ask of $200.00, then $200.01, then $200.02 until you either bought all shares with an ask up to $210, or until you bought a million shares.  With AAPL, you probably bid the price up to $201 with a million shares, so you made lots of people very happy while losing about 10 million dollars. So let's say this is a much smaller company.  You have driven the share price up to $210, but there is nobody else bidding above $200. So nobody is going to buy your shares. Until some people think there is something going on and enter higher bids, but then some people will take advantage of this and ask lower than your $210. And there will be more people trying to make cash by selling their shares at a good price than people tricked into bidding over $200, so it is most likely that you lose out.  (This completely ignores legality; attempting to do this would be market manipulation and in many countries illegal. I don't know if losing money in the process would protect you from criminal charges). "***JamieJBartlett***:  &gt;&amp;#91;2012/10/22&amp;#93;&amp;#91;17:30:33&amp;#93;  &gt;[&amp;#91;Translate&amp;#93;](http://translate.google.com/#auto|auto|At 34,798 words, PayPal%27s terms and conditions are 4,000 words longer than Hamlet. %22Brevity is the soul of wit%22. %28Act II, scene II%29 'google translate this tweet'): At 34,798 words, PayPal's terms and conditions are 4,000 words longer than Hamlet. ""Brevity is the soul of wit"". &amp;#40;Act II, scene II&amp;#41;  [&amp;#91;This comment was posted by a bot&amp;#93;&amp;#91;FAQ&amp;#93;](http://www.reddit.com/r/tweet_poster/faq 'tweet_poster')[&amp;#91;Did I get it wrong?&amp;#93;](http://www.reddit.com/message/compose/?to=tweet_poster&amp;subject=Error%20Report&amp;message=[Oops!](http://reddit.com/r/business/comments/11wkuv\)%0d%0dPlease leave the subject and this link unaltered, but feel free to add a description here. 'report an error')" "Oh, I understand now -- we're having an absurd, meaningless conversation about an obscure theoretical point.  When you can tell me how you can determine a ""minimum cash"" level from a public company's filings, we can continue the discussion.  Otherwise, make a simplifying assumption and move on.  I misunderstood -- I thought we were actually trying to understand the difference between enterprise value and equity value / understand the implication of an enterprise value multiple." The Bid price is simply the highest buy price currently being offered and the Ask price simply the lowest sell price being offered. The list of Bid and Ask prices is called the market depth. When the Bid and Ask prices match then a sale goes through. When looking to sell you would generally look at both the Bid and Ask prices. As a seller you want to be matched with the Bid price to get a sale, but you also need to check the current list of Ask prices. If the price you want to sell at is too high you will be placed down the Ask price list, and unless the price moves up to match your sell price you will not end up selling. On the other-hand, if your price to sell is too low and in fact much lower than the current lowest sell price you may get a quick sale but maybe at a lower price than you could have gotten. Similarly, when looking to buy, you would generally also look at both the Bid and Ask prices. As a buyer you want to be matched with the Ask price to get a sale, but you also need to check the current list of Bid prices. If the price you want to buy at is too low you will be placed down the Bid price list, and unless the price moves down to match your buy price you will no end up buying. On the other-hand, if your price to buy is too high and in fact much higher than the current highest buy price you may get a quick purchase but maybe at a higher price than you could have gotten. So, whether buying or selling, it is important to look at and consider both the Bid and Ask prices in the market depth. Did he say why he wants double your asking price? Did you explain to him how you came up with the offer you made? Sometimes exploring interests (why people make their decisions) is more helpful than bargaining over positions. If you understand why he wants double your offer (and he understands why you're offering a lower price) you might get closer to an agreement. Another option is to defer to a disinterested third-party who will pick a valuation for the company, and you can agree to abide by their decision (and pick a payout schedule if necessary) Think about what you'll do if you can't come to an agreement: is walking away from the business an option and going out on your own? What would happen to him if you simply walk away? It might be in his best interest to negotiate. Or will you reluctantly pay his asking price? Or can you sell the business to him? One option when partners need to split up is to have one of them set a value for the company, and the other decides if he wants to be the buyer or seller. (It's like the trick with kids where one cuts the cake and the other selects which slice he wants.) Maybe you can come up with a fair way of valuing the company. A lawyer will be needed to draw it all up, but you can agree on the framework of the deal ahead of time and save some money and stress. Last thought: when a win-win agreement isn't possible, sometimes the next best compromise is where everyone feels like he got equally screwed. That's ok, too. "You asked for simple, and I promise you this is... it just looks a bit math-heavy to start with because we have to handle a couple of different scenarios. Bear with me :) I find the best way to deal with these kinds of questions is to put together a ""Total cost"" for each option, for a sensible amount of time, and see what the difference is. We'll include the current cost for both options, plus the subsequent costs for 12 months: I find that more useful than a straight ""which is more expensive right now"" because it includes the potential costs of the next upgrade, and any changes to the plan. Let's throw some numbers together for the next 12 months (if your current plan is longer than 12 months, read the note at the bottom first) First, write down the cost of these things **The above assume that you have two options if you take the repair option (and only one option if you use the buy-out option). The two options we're assuming here are that you can either:  If you'd choose the same new plan regardless of whether you take the $100 or $150 option, there's no need to include both options: to simplify things you can just use the same numbers for both b/c and Pu/Py and the calculation below will still work. When you've found and written down the above, just do the sums below to find your two total costs over 12 months. Nothing fancy, just plug the numbers above into the equation. eg if Pe (eBay value of the phone) is $80, replace Pe with 80. Don't forget to do the parts in brackets first! That's your total cost for both options for the next year. Note: I'm assuming that your plan ends within the next 12 months. If not, just replace 12 in the above calculations with another term! You can also do this if you want to find out the price difference over a longer period (noting that if you upgrade to the same plan regardless of choice, you'll get the same answer for any period longer than your current contract)" If you are looking to go long (buy) you would use bid prices as this is what you will be matched against for your order to be executed and a trade to go through. If you are looking to go short (sell) you would use the ask prices as this is what you will be matched against for your order to be executed and a trade go through. In your analysis you could use either this convention or the midpoint of the two prices. As FX is very liquid the bid and ask prices would be quite close to each other, so the easiest way to do your analysis is to use the convention I listed above. Depends on when you are seeing these bids & asks-- off hours, many market makers pull their bid & ask prices entirely.  In a lightly traded stock there may just be no market except during the regular trading day. I work in a firm that performs this kind of execution for a number of instutional traders. We sell a number of algorithms, and a lot of research goes into building good market signals and forecasts, but the basic idea is that we make a trade-off between time to execute and market impact. This generally means that we're doing a mix of everything you said; we will join the bid for some fraction of our size, and also hit the offer when it looks like the price might be moving away from us. In some certain situations we will even sweep the book several levels deep to avoid tipping off market makers and having them adjust in anticipation of the rest of our order. Bid and ask prices are the reigning highest buy price and lowest sell price in the market which doesn't mean one must only buy/sell at thise prices. That said one can buy/sell at whatever price they so wish although doing it at any other price than the bid/ask is usually harder as other market participants will gravitate to the reigning bid/ask price. So in theory you can buy at ask and sell at bid, whether or not your order will be filled is another matter altogether. "I am not familiar with this broker, but I believe this is what is going on: When entering combination orders (in this case the purchase of stocks and the writing of a call), it does not make sense to set a limit price on the two ""legs"" of the order separately. In that case it may be possible that one order gets executed, but the other not, for example. Instead you can specify the total amount you are willing to pay (net debit) or receive (net credit) per item. For this particular choice of a ""buy and write"" strategy, a net credit does not make sense as JoeTaxpayer has explained. Hence if you would choose this option, the order would never get executed. For some combinations of options it does make sense however. It is perhaps also good to see where the max gain numbers come from. In the first case, the gain would be maximal if the stock rises to the strike of the call or higher. In that case you would be payed out $2,50 * 100 = $250, but you have paid $1,41*100 for the combination, hence this leaves a profit of $109 (disregarding transaction fees). In the other case you would have been paid $1,41 for the position. Hence in that case the total profit would be ($1,41+$2,50)*100 = $391. But as said, such an order would not be executed. By the way, note that in your screenshot the bid is at 0, so writing a call would not earn you anything at all." One broker told me that I have to simply read the ask size and the bid size, seeing what the market makers are offering. This implies that my order would have to match that price exactly, which is unfortunate because options contract spreads can be WIDE. Also, if my planned position size is larger than the best bid/best ask, then I should break up the order, which is also unfortunate because most brokers charge a lot for options orders.