What factors make someone buy or sell a stock?
"First, note that a share represents a % of ownership of a company. In addition to the right to vote in the management of the company [by voting on the board of directors, who hires the CEO, who hires the VPs, etc...], this gives you the right to all future value of the company after paying off expenses and debts. You will receive this money in two forms: dividends approved by the board of directors, and the final liquidation value if the company closes shop. There are many ways to attempt to determine the value of a company, but the basic theory is that the company is worth a cashflow stream equal to all future dividends + the liquidation value. So, the market's ""goal"" is to attempt to determine what that future cash flow stream is, and what the risk related to it is. Depending on who you talk to, a typical stock market has some degree of 'market efficiency'. Market efficiency is basically a comment about how quickly the market reacts to news. In a regulated marketplace with a high degree of information available, market efficiency should be quite high. This basically means that stock markets in developed countries have enough traders and enough news reporting that as soon as something public is known about a company, there are many, many people who take that information and attempt to predict the impact on future earnings of the company. For example, if Starbucks announces earnings that were 10% less than estimated previously, the market will quickly respond with people buying Starbucks shares lowering their price on the assumption that the total value of the Starbucks company has decreased. Most of this trading analysis is done by institutional investors. It isn't simply office workers selling shares on their break in the coffee room, it's mostly people in the finance industry who specialize in various areas for their firms, and work to quickly react to news like this. Is the market perfectly efficient? No. The psychology of trading [ie: people panicking, or reacting based on emotion instead of logic], as well as any inadequacy of information, means that not all news is perfectly acted upon immediately. However, my personal opinion is that for large markets, the market is roughly efficient enough that you can assume that you won't be able to read the newspaper and analyze stock news in a way better than the institutional investors. If a market is generally efficient, then it would be very difficult for a group of people to manipulate it, because someone else would quickly take advantage of that. For example, you suggest that some people might collectively 'short AMZN' [a company worth half a trillion dollars, so your nefarious group would need to have $5 Billion of capital just to trade 1% of the company]. If someone did that, the rest of the market would happily buy up AMZN at reduced prices, and the people who shorted it would be left holding the bag. However, when you deal with smaller items, some more likely market manipulation can occur. For example, when trading penny stocks, there are people who attempt to manipulate the stock price and then make a profitable trade afterwards. This takes advantage of the low amount of information available for tiny companies, as well as the limited number of institutional investors who pay attention to them. Effectively it attempts to manipulate people who are not very sophisticated. So, some manipulation can occur in markets with limited information, but for the most part prices are determined by the 'market consensus' on what the future profits of a company will be.  Additional example of what a share really is: Imagine your neighbor has a treasure chest on his driveway: He gathers the neighborhood together, and asks if anyone wants to buy a % of the value he will get from opening the treasure chest. Perhaps it's a glass treasure chest, and you can mostly see inside it. You see that it is mostly gold and silver, and you weigh the chest and can see that it's about 100 lbs all together. So in your head, you take the price of gold and silver, and estimate how much gold is in the chest, and how much silver is there. You estimate that the chest has roughly $1,000,000 of value inside. So, you offer to buy 10% of the chest, for $90k [you don't want to pay exactly 10% of the value of the company, because you aren't completely sure of the value; you are taking on some risk, so you want to be compensated for that risk].  Now assume all your neighbors value the chest themselves, and they come up with the same approximate value as you. So your neighbor hands out little certificates to 10 of you, and they each say ""this person has a right to 10% of the value of the treasure chest"". He then calls for a vote from all the new 'shareholders', and asks if you want to get the money back as soon as he sells the chest, or if you want him to buy a ship and try and find more chests. It seems you're all impatient, because you all vote to fully pay out the money as soon as he has it. So your neighbor collects his $900k [$90k for each 10% share, * 10], and heads to the goldsmith to sell the chest. But before he gets there, a news report comes out that the price of gold has gone up. Because you own a share of something based on the price of gold, you know that your 10% treasure chest investment has increased in value. You now believe that your 10% is worth $105k. You put a flyer up around the neighborhood, saying you will sell your share for $105k. Because other flyers are going up to sell for about $103-$106k, it seems your valuation was mostly consistent with the market.  Eventually someone driving by sees your flyer, and offers you $104k for your shares. You agree, because you want the cash now and don't want to wait for the treasure chest to be sold. Now, when the treasure chest gets sold to the goldsmith, assume it sells for $1,060,000 [turns out you underestimated the value of the company]. The person who bought your 10% share will get $106k [he gained $2k]. Your neighbor who found the chest got $900k [because he sold the shares earlier, when the value of the chest was less clear], and you got $104k, which for you was a gain of $14k above what you paid for it. This is basically what happens with shares. Buy owning a portion of the company, you have a right to get a dividend of future earnings. But, it could take a long time for you to get those earnings, and they might not be exactly what you expect. So some people do buy and sell shares to try and earn money, but the reason they are able to do that is because the shares are inherently worth something - they are worth a small % of the company and its earnings." "Stock price is determined by the buyers and sellers, correct? Correct! ""Everything is worth what its purchaser will pay for it""-Publius Syrus What causes people to buy or sell? Is it news? earnings? stock analysis and techniques? All of these things influence investors' perception of how much a stock is worth. If AMZN makes a lot of money one quarter, then the price might go up. But maybe public perception of AMZN changes because of a large scandal. This could cause the share price to decline even with the favorable earnings report. Why do these 'good' or 'bad' news make people want to buy/sell a stock? People invest to make money. If it looks like a company is going to take a turn for the worst, people will sell. If it looks like the company has a bright, cash-laden future in front of them, people will buy. News is one of the many factors people use to determine how well a company will do. Theoretically could a bunch of people short AMZN and drive down the price regardless of how well it is doing? Say investors wanted to boycott AMZN in order to drive down the cost and get some cheap shares. This is pretty silly, but say for the sake of the argument that everyone who owned AMZN decided to sell their shares and no other investor was willing to buy the shares for less than $0.01, then AMZN shares would be ""worth"" $0.01 in that aspect. That is extremely unlikely to happen, though, for two reasons:" why sell?  Because the stock no longer fits your strategy.  Or you've lost faith in the company. In our case, it's because we're taking our principal out and buying something else.  Our strategy is, basically, to sell (or offer to sell) after the we can sell and get our principal out, after taxes.  That includes dividends -- we reduce the sell price a little with every dividend collected.
"I always liked the answer that in the short term, the market is a voting machine and in the long term the market is a weighing machine. People can ""vote"" a stock up or down in the short term.   In the long term, typically, the intrinsic value of a company will be reflected in the price. It's a rule of thumb, not perfect, but it is generally true. I think it's from an old investing book that talks about ""Mr. Market"".   Maybe it's from one of Warren Buffet's annual letters.    Anyone know? :)" Prices can go up or down for a variety of reasons. If interest rates decline typically every stock goes up, and vice versa. Ultimately, there are two main value-related factors to a price of a stock: the dividends the company may issue or the payoff in the event the company is bought by someone else. Any dividend paid will give concrete value to a stock. For example, imagine a company has shares selling at $1.00 and they announce that they will pay a dividend at the end of the year of $1.00 per share. If their claim is believable then the stock is practically FREE at $1.00 a share, so in all likelihood the stock will go up a lot, just on the basis of the dividend alone. If a company is bought by another, they need to buy at least a majority of the shares, and in some cases all the shares. Since the price the buyer will be willing to pay for the company is related to its potential future income for the buyer, the more profitable the company is, the more a buyer will be willing to pay and hence the greater the value of the stock. "I used to be in research department for big financial data company.   Tell your son that there are three factors: Most people think that net sales vs. expectations is the only factor.  It might not even be the biggest.  It is simply how much money did company make.  Note that this is not how many units they sold.  For most companies they will have adjustable pricing and incentives in their sector.  For example let's talk about a new company selling Superman Kid's Bikes (with a cape the flips out when you hit a certain speed).  The company has it in Walmart at one price, Target at another, Toys R' Us even cheaper, Amazon (making more profit there), and other stores.  They are doing ""OK"" come Dec. 1 but holiday season being half way over they slash price from $100 to $80 because they have tons of inventory.  What are looking at her is how much money did they make.  Note that marketing, advertising, legal (setting up contracts) are a bit fixed. In my opinion consumer sentiment is the #1 thing for a company that sells a product.  Incredible consumer sentiment is like millions of dollars in free advertising.  So let's say Dec. 15th comes and the reviews on the Superman Bike are through the roof.  Every loves it, no major defects.  Company can't even supply the retailers now because after slashing the price it became a great buy.  A common investor might be pissed that some dummy at the company slashed the prices so they could have had a much better profit margin, but at the same time it wouldn't have led to an onslaught of sales and consumer sentiment. And the last area is product sell-off.  This doesn't apply to all product but most.  Some products will only have a technology shelf life, some will actually go bad or out of fashion, and even selling Superman bikes you want to get those to the store because the product is so big.  So ignoring making a profit can a company sell off inventory at or around cost.  If they can't, even if they made a profit, their risk factor goes up. So let's get back to Superman Bikes.  This is the only product company ABC has.  They had expected holiday sales at 100 million and profits at 40 million.  They ended up at 120 million and 44 million.   Let's say their stock was $20 before any information was gathered by the public (remember for most companies info is gathered daily now so this is rather simplistic).  So you might expect that the stock would rise to maybe $24 - to which if you were an investor is a great profit. However this company has a cult consumer following who are waiting for the Captain America Bike (shoots discs) and the Hulk Bike (turns green when you go fast).  Let's say consumer sentiment and projections base off that put next holiday sales at $250 million.  So maybe the company is worth $40 a share now.  But consumer sentiment is funny because not only does it effect future projections but it also effects perceived present value of company - which may have the stock trading at $60 a share (think earnings and companies like Google).  Having a company people feel proud owning or thinking is cool is also a indicator or share worth. I gave you a really good example of a very successful company selling Superman Bikes... There are just as many companies that have the opposite happening.  Imagine missing sales goals by a few million with bad consumer feedback and all of a sudden your company goes from $20 to $5 a share." "Not sure I fully understand your question but my take on it is this: There a lot of people out there that admire companies and own the stock just because they like the company. For example, I know some kids who own Disney stock. They only have a share or two but they keep it because they want to say ""I own a part of Disney.""  Realistically speaking, if they hold or sell the stock it is so minuscule to have any realizable affect on the overall value of the stock which does not really make the company look better from an investor perspective. However, if a company has people that just want to own the stock just like your uncle are indeed ""better"" because they must have provided a product or service that is valued intrinsically." "Buying pressure is when there are more buy orders than sell orders outstanding.  Just because someone wants to buy a stock doesn't mean there's a seller ready to fill that order.  When there's buying pressure, stock prices rise.  When there's selling pressure, stock prices fall. There can be high volume where buying and selling are roughly equal, in which case share prices wouldn't move much. The market makers who actually fill buy and sell orders for stock will raise share prices in the face of buying pressure and lower them in the face of selling pressure.  That's because they get to keep the margin between what they bought shares from a seller for and what they can sell them to a new buyer for.  Here's an explanation from InvestorPlace.com about ""buying pressure"": Buying pressure can basically be defined as increasingly higher demand for a particular stock's shares. This demand for shares exceeds the supply and causes the price to rise. ... The strength or weakness of a stock determines how much buying or selling interest will be required to break support and resistance areas. I hope this helps!" A stock market is just that, a market place where buyers and sellers come together to buy and sell shares in companies listed on that stock market. There is no global stock price, the price relates to the last price a stock was traded at on a particular stock market. However, a company can be listed on more than one stock exchange. For example, some Australian companies are listed both on the Australian Stock Exchange (ASX) and the NYSE, and they usually trade at different prices on the different exchanges. Also, there is no formula to determine a stock price. In your example where C wants to buy at 110 and B wants to sell at 120, there will be no sale until one or both of them decides to change their bid or offer to match the opposite, or until new buyers and/or sellers come into the market closing the gap between the buy and sell prices and creating more liquidity. It is all to do with supply and demand and peoples' emotions. "People in this case, are large institutional investors. The ""bid ask"" spread is for ""small traders"" like yourself. It is put out by the so-called specialists (or ""market makers"") and is typically good for hundreds or thousands of shares at a time. Normally, 2 points on a 50 stock is a wide spread, and the market maker will make quite a bit of money on it trading with people like yourself. It's different if a large institution, say Fidelity, wants to sell, say 1 million shares of the stock. Depending on market conditions, it may have trouble finding buyers willing to buy in those amounts anywhere near 50. To ""move"" such a large block of stock, they may have to put the equivalent of K-Mart's old ""Blue Light Special"" on, several points below." If the price has gone up from what it was when the person bought, he may sell to collect his profit and spend the money. If someone intends to keep his money in the market, the trick is that you don't know when the price of a given stock will peak. If you could tell the future, sure, you'd buy when the stock was at its lowest point, just before it started up, and then sell at the highest point, just before it started down. But no one knows for sure what those points are. If a stockholder really KNOWS that demand is increasing and the price WILL go up, sure, it would be foolish to sell. But you can never KNOW that. (Or if you have some way that you do know that, please call me and share your knowledge.) Given that hedge funds and trading firms employ scores of highly   intelligent analysts, programmers, and managers to game the market,   what shot does the average person have at successful investing in the   stock market? Good question and the existing answers provide valuable insight.  I will add one major ingredient to successful investing: emotion.  The analysts and experts that Goldman Sachs, Morgan Stanley or the best hedge funds employ may have some of the most advanced analytical skills in the world, but knowing and doing still greatly differ.  Consider how many of these same companies and funds thought real estate was a great buy before the housing bubble.  Why?  FOMO (fear of missing out; what some people call greed). One of my friends purchased Macy's and Las Vegas Sands in 2009 at around $5 for M and $2 for LVS.  He never graduated high school, so we might (foolishly) refer to him as below average because he's not as educated as those individuals at Goldman Sachs, Morgan Stanley, etc.  Today M sits around $40 a share and LVS at around $70. Those returns in five years. The difference?  Emotion.  He holds little attachment to money (lives on very little) and thus had the freedom to take a chance, which to him didn't feel like a chance.  In a nutshell, his emotions were in the right place and he studied a little bit about investing (read two article) and took action.  Most of the people who I know, which easily had quintuple his wealth and made significantly more than he did, didn't take a chance (even on an index fund) because of their fear of loss. I mean everyone knows to buy low, right?  But how many actually do?  So knowing what to do is great; just be sure you have the courage to act on what you know. "It is not clear when you mean ""company's directors"" are they also majority owners.   There are several reasons for Buy;   Similarly there are enough reasons for sell;   Quite often the exact reasons for Buy or Sell are not known and hence blindly following that strategy is not useful. It can be one of the inputs to make a decision." "I think the question can be answered by realizing that whoever is buying the stock is buying it from someone who can do the same mathematics. Ask your son to imagine that everyone planned to buy the stock exactly one week before Christmas.  Would the price still be cheap?  The problem is that if everyone knows the price will go up, the people who own it already won't want to sell.  If you're buying something from someone who doesn't really want to sell it, you have to pay more to get it.  So the price goes up a week before Christmas, rather than after Christmas. But of course everyone else can figure this out too.  So they are going to buy 2 weeks before, but that means the price goes up 2 weeks before rather than 1 week.  You play this game over and over, and eventually the expected increased Christmas sales are ""priced in"".  But of course there is a chance people are setting the price based on a mistaken belief. So the winner isn't the person who buys just before the others, but rather the one who can more accurately predict what the sales will be (this is why insider trading is so tempting even if it's illegal).  The price you see right now represents what people anticipate the price will be in the future, what dividends are expected in the future, how much risk people think there is, and how that compares with other available investments." Will there be a scenario in which I want to sell, but nobody wants to buy from me and I'm stuck at the brokerage website? Similarly, if nobody wants to sell their stocks, I will not be able to buy at all? You're thinking of this as a normal purchase, but that's not really how US stock markets operate. First, just because there are shares of stock purchased, it doesn't mean that there was real investor buyer and seller demand for that instrument (at that point in time).  Markets have dedicated middlemen called Market Makers (NASDAQ) or Specialists (NYSE), who are responsible to make sure that there is always someone to buy or sell; this ensures that all instruments have sufficient liquidity.  Market Makers and specialists may decide to lower their bid on a stock based on a high number of sellers, or raise their ask for a high number of buyers. During an investor rush to buy or sell an instrument (perhaps in response to a news release), it's possible for the Market Maker / specialist to accumulate or distribute a large number of shares, without end-investors like you or I being involved on both sides of the same transaction. "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.)" "I did once read a book titled ""How I made a million dollars on the stock market"". It sounded realistic enough to be a true story. The author made it clear on the first page that (a) this was due to some exceptional circumstances, (b) that he would never again be able to pull off something like this, and (c) you would never be able to pull of something like this, except with extreme luck.  (The situation was small company A with a majority shareholder, other small company B tries to gain control by buying all the shares, the majority shareholder of A trying to prevent this by buying as many shares as possible, share price shooting up ridiculously, ""smart"" traders selling uncovered shorts to benefit when the price inevitably drops, the book author buying $5,000 worth of shares because they were going up, and then one enormous short squeeze catching out the traders. And he claimed having sold his shares for over a million - before the price dropped back to normal).  Clearly not a matter of ""playing your cards right"", but of having an enormous amount of luck." "Feel free to educate man. Everything I can find says the same thing.  [Investopedia](http://www.investopedia.com/ask/answers/100314/what-are-key-factors-cause-market-go-and-down.asp)  &gt;If there are a greater number of buyers than sellers (more demand), the buyers bid up the prices of the stocks to entice sellers to get rid of them. Conversely, a larger number of sellers bids down the price of stocks hoping to entice buyers to purchase.  Yes, if a company is performing well, you might find that more people want to buy then sale.  That would cause it to go up.  But if no one wants to buy, it doesn't matter how well the company is doing.  I mean really, how would that work?  Someone in the company notices they had more sales today then yesterday, email someone on wallstreet and they just mouse wheel the stock price up to something higher?  Say the stock is $1.00 right now.  But the lowest buy order is $.90.  and the highest sale order is $1.10.  (I guess there is some math there making is $1.)  As soon as someone says, yeah.  I'll sale at 90 cents, it'll go down.  If someone says yeah, I'll buy at $1.10 it'll go up.    I'm sure there is more to it than that.  But everything I can find.  It 100% has to have people more people wanting to buy then sale for it to go up.  If more want to sale then buy, it'll go down.   But hey, if this is way off base.  Go ahead and fill me in.  I'm open to CMV.  This was all found after a short amount of time researching [""What makes stock prices go up?""](https://www.google.com/search?q=What+makes+stock+prices+go+up%3F&amp;oq=What+makes+stock+prices+go+up%3F&amp;gs_l=psy-ab.3..0i71k1l4.43421.43421.0.43882.0.0.0.0.0.0.0.0..0.0....0...1.1.64.psy-ab..0.0.0....0.6Crfejzb3XY)"