Best buying price on stock marketing based on market depth detail (CSE atrad tool)
If you are buying your order will be placed in Bid list. If you are selling your order will be placed in the Ask list. The highest Bid price will be placed at the top of the Bid list and the lowest Ask price will be placed at the top of the Ask list. When a Bid and Ask price are matched a transaction will take place and it will the last traded price. If you are looking to buy at a lower price, say $155.01, your Bid price will be placed 3rd in the Bid list, and unless the Ask prices fall to that level, your order will remain in the list until it trades, it expires or you cancel it. If prices don't fall to you Bid price you will not get a trade. If you wanted your trade to go through you could either place a limit buy order closer to the lowest Ask price (however this is still not a certainty), or to be certain place a market buy order which will trade at the lowest Ask price. "When I first started working in finance I was given a rule of thumb to decide which price you will get in the market: ""You will always get the worst price for your deal, so when buying you get the higher ask price and when selling you get the lower bid price."" I like to think of it in terms of the market as a participant who always buys at the lowest price they can (i.e. buys from you) and sells at the highest price they can. If that weren't true there would be an arbitrage opportunity and free money never exists for long."
Consider the mechanic which actually drives the 'price' of a stock. In simplest terms, the 'price' of a stock is the price at which the most recent trade occurred. ie: if the price of IBM is $100/share, that means the last time someone bought IBM stock, they paid $100. Above and below the 'spot price', are dozens/hundreds/thousands of buyers and sellers who have placed orders that no one is yet willing to match. ie: if IBM's spot price is at $100, there could still be 10,000 people willing to sell for $101 (called the 'ask' price, for the lowest price someone is currently willing to sell at), and 15,000 willing to buy for $99 (called the 'bid' price, for the highest price someone is currently willing to buy for).  Until someone is willing to buy for $101, then no one will be able to sell at $101. Until someone is willing to sell for $99, no one will be able to buy for $99. Typically orders are placed in the market at a particular limit. Meaning that those orders to buy at $99/sell at $101 are already in the 'system', and will be matched immediately as soon as someone is willing to meet the price on the other side. Now consider general market economics: high demand drives up price, and high supply drives down price. If the details above for IBM were yesterday, and today some news came out that IBM was laying off employees, imagine that another 10,000 people who held shares wanted to sell. Now there would be 20,000 sellers and only 15,000 buyers. If those new sellers were aggressive about wanting to sell, they would have to drop their price to $99, to match the highest buyers in the market. Put together, this means that as more sellers enter the market, supply of shares increases, driving down price. Conversely, as more buyers enter the market, demand for shares increases, driving up share price. As a result of the above, you can say that (all else being equal) if price for a stock goes up, there were more buyers that day, and if price goes down, there were more sellers that day. On the face of it, that is not necessarily true, because you could have the same number of buyers and sellers, one side could have simply decreased/increased their acceptable price to match the other side. "The dow jones is an index of 30 stocks that's weighted based on the price per share of these stocks. To calculate the DJIA, the sum of the prices of all 30 stocks is divided by a divisor, the Dow Divisor. The divisor is adjusted in case of stock splits, spinoffs or similar structural changes, to ensure that such events do not in themselves alter the numerical value of the DJIA.  Prices are the result of supply and demand. Demand is defined as simply as ""I want this badly enough to pay cash for it"", ""supply is ""I own this and don't want to own it, therefore I'll sell it""  When investors go about deciding they'd like to buy some stock from people who own it and are wanting to sell it, a market is generated and a price both are willing to sell/buy at is found. If the price is too high/low, you won't sell or buy. The price has to be ""right"" based on your own personal valuation.   Since these trades are done through an exchange and are so common, literally millions of shares are traded per day, you get the best price available at that moment for your shares. If person A is only willing to give you 100 dollars and person B is willing to give you 100.01, screw person A. I'm selling shares to person B.  When this done on a macro-level (millions of shares traded per day) the exchanges will track and make public the ""price movement"" of what the market is willing to give for each and every publicly traded stock.  TLDR: SUPPLY AND DEMAND. DOW USES THEIR OWN METHODS." Never. Isn't that the whole idea of the limit order. You want a bargain, not the price the seller wants. And when the market opens it is volatile at the most, just an observation mayn't be correct. Let it stabilize a bit. The other thing is you might miss the opportunity. But as an investor you should stick to your guns and say I wouldn't buy any higher than this or sell any lower than this. As you are going long, buying at the right price is essential. You aren't going to run away tomorrow, so be smart.  Probably this is what Warren Buffet said, it is important to buy a good stock at the right price rather than buying a good stock at the wrong price. There is no fixed answer to your question. It can be anything. You can check what analysts, someone with reputation of predicting correctly(not always), say would be the increase/decrease in the price of a stock in the projected future. They do quite a lot of data crunching to reach a price. Don't take their values as sacrosanct but collate from a number of sources and take an average or some sorts of it. You can then take an educated guess of how much you would be willing to pay depending the gain or loss predicted. Else if you don't believe the analysts(almost all don't have a stellar reputation) you can do all the data crunching yourself if you have the time and right tools. "You can think of the situation as a kind of Nash equilibrium.  If ""the market"" values stock based on the value of the company, then from an individual point of view it makes sense to value stock the same way. As an illustration, imagine that stock prices were associated with the amount of precipitation at the company's location, rather than the assets of the company.  In this imaginary stock market, it would not benefit you to buy and sell stock according to the company's value.  Instead, you would profit most from buying and selling according to the weather, like everyone else.  (Whether this system — or the current one — would be stable in the long-term is another matter entirely.)" You can't tell for sure.  If there was such a technique then everyone would use it and the price would instantly change to reflect the future price value. However, trade volume does say something.  If you have a lemonade stand and offer a large glass of ice cold lemonade for 1c on a hot summer day I'm pretty sure you'll have high trading volume.  If you offer it for $5000 the trading volume is going to be around zero. Since the supply of lemonade is presumably limited at some point dropping the price further isn't going to increase the number of transactions.   Trade volumes reflect to some degree the difference of valuations between buyers and sellers and the supply and demand.  It's another piece of information that you can try looking at and interpreting.  If you can be more successful at this than the majority of others on the market (not very likely) you may get a small edge.  I'm willing to bet that high frequency trading algorithms factor volume into their trading decisions among multiple other factors. How does one buy this quantity of TIPS? Do you simply buy directly from the US Treasury? You will might have to go through a financial institution like a broker or a bank. Edit: You can also buy bonds directly with TreasuryDirect. Is it cheaper to buy a fund that invests in TIPS? It might be cheaper depending on the fund  itself. But you can't know for sure the price that the fund will be worth at you payout date. Since bonds can go up in value (and are likely to with rates this low), is there a way to measure potential downside? Statistically speaking yes. You can look at the variation in price/interest of the bonds in the last years, to see how they usually move, then compute the price range where they are likely to be (that can be wide for volatile securities). But there is no guarantee that there won't be some black swan event that will make the price shoot up/down. In another word, it's speculation Can I mitigate downside risk by choosing different TIPS maturity? There are quantitative strategies to do that, like finding that some products that are negatively correlated, such that a loss in one is be hedged by a gain in another. However those correlation are likely to be just statistics. And for every product that you buy you are likely to have to pay some fees for your bank/broker which can be more devastating than the inflation itself. Is there some other strategy I should be considering to protect my cash against inflation (or maybe a mixed strategy)? As I wrote above, trying to use complex financial products can incurs loss and will have fees (both for buying and selling). Is it really necessary to hedge from a 2% inflation by taking such risk? Personally, I don't think so. If I were you I would just be buying bonds maturing for your payout date. That would negate the reselling risk and reduce the fees. The main question is, how much money you want to make?  With every transaction, you  should calculate the real price as the price plus costs. For example, if you but 10 GreatCorp stock of £100 each, and the transaction cost is £20 , then the real cost of buying a single share is in fact buying price of stock + broker costs / amount bought, or £104 in this case.  Now you want to make a profit so calculate your desired profit margin. You want to receive a sales price of buying price + profit margin + broker costs / amount bought. Suppose that you'd like 5%, then you'll need the price per stock of my example to increase to 100 + 5% + £40 / 10 = £109.  So you it only becomes worth while if you feel confident that GreatCorp's stock  will rise to that level. Read the yearly balance of that company to see if they don't have any debt, and are profitable. Look at their dividend earning history. Study the stock's candle graphs of the last ten years or so, to find out if there's no seasonal effects, and if the stock performs well overall. Get to know the company well. You should only buy GreatCorp shares after doing your homework.  But what about switching to another stock of LovelyInc? Actually it doesn't matter, since it's best to separate transactions. Sell your GreatCorp's stock when it has reached the desired profit margin or if it seems it is underperforming. Cut your losses! Make the calculations for LovelyCorp's shares without reference to GreatCorp's, and decide like that if it's worth while to buy. There's only one real list that states what people think stock prices should be, and that's the stocks order book. That lists the prices at which stock owners are willing to buy stocks now, and the price that buyers are willing to pay.  A secondary measure is the corresponding options price. Anything else is just an opinion and not backed by money.