How To Interpret Share Prices?
The missing information is at the end of the first line: the price is from NASDAQ (most specifically Nasdaq Global Select), which is a stock exchange in the USA, so the price is in US Dollars.
"You could not have two stocks both at $40, both with P/E 2, but one an EPS of $5 and the other $10.  EPS = Earnings Per Share P/E = Price per share/Earnings Per Share So, in your example, the stock with EPS of $5 has a P/E of 8, and the stock with an EPS of $10 has a P/E of 4.  So no, it's not valid way of looking at things, because your understanding of EPS and P/E is incorrect. Update: Ok, with that fixed, I think I understand your question better. This isn't a valid way of looking at P/E. You nailed one problem yourself at the end of the post: The tricky part is that you have to assume certain values remain   constant, I suppose But besides that, it still doesn't work. It seems to make sense in the context of investor psychology: if a stock is ""supposed to"" trade at a low P/E, like a utility, that it would stay at that low P/E, and thus a $1 worth of EPS increase would result in lower $$ price increase than a stock that was ""supposed to"" have a high P/E. And that would be true. But let's game it out: Scenario Say you have two stocks, ABC and XYZ. Both have $5 EPS. ABC is a utility, so it has a low P/E of 5, and thus trades at $25/share. XYZ is a high flying tech company, so it has a P/E of 10, thus trading at $50/share. If both companies increase their EPS by $1, to $6, and the P/Es remain the same, that means company ABC rises to $30, and company XYZ rises to $60. Hey! One went up $5, and the other $10, twice as much! That means XYZ was the better investment, right? Nope. You see, shares are not tokens, and you don't get an identical, arbitrary number of them. You make an investment, and that's in dollars. So, say you'd invested $1,000 in each. $1,000 in ABC buys you 40 shares. $1,000 in XYZ buys you 20 shares. Their EPS adds that buck, the shares rise to maintain P/E, and you have: ABC: $6 EPS at P/E 5 = $30/share. Position value = 40 shares x $30/share = $1,200 XYZ: $6 EPS at P/E 10 = $60/share. Position value = 20 shares x $60/share = $1,200 They both make you the exact same 20% profit. It makes sense when you think about it this way: a 20% increase in EPS is going to give you a 20% increase in price if the P/E is to remain constant. It doesn't matter what the dollar amount of the EPS or the share price is." Your observation is mostly right, that 1 is a the number around which this varies.  You are actually referencing PEG, P/E to Growth ratio, which is a common benchmark to use to evaluate a stock. The article I link to provides more discussion. "You can interpret prices in any way you wish, but the commonly quoted ""price"" is the last price traded. If your broker routes those orders, unlikely because they will be considered ""unfair"" and will probably be busted by the exchange, the only way to drive the price to the heights & lows in your example is to have an overwhelming amount of quantity relative to the order book. Your orders will hit the opposing limit orders until your quantity is exhausted, starting from the best price to the worst price. This is the functional equivalent to a market order." There is no formula for calculating a stock price based on the financials of a company. A stock price is set by the market and always has a component built into it that is based on something outside of the current valuation of a company using its financials. Essentially, the stock price of a company per share is whatever the best price it can get on the open market. If you are looking at how to evaluate if a stock is a good value at the current price, then look at some of the answers, but I wanted to answer this based on the way you phrased the question. Ideally, stock price reflects the value of the company, the dividends it is expected to pay, and what people expect the future value of the company to be. Only one of those (maybe one and a half) is related to current  sales, and not always directly. Short-term motion of a stock is even less directly linked, since it also reflects previous expectations. A company can announce disappointing sales and see its stock go up, if the previous price was based on expecting  worse news. It is possible to figure out the next price. Just not for Joe Average. A stock exchange has a orderbook. This has two sides. One side has alle the buyers, how many shares they want, and what they are willing to pay. The other side has all the sellers, how many shares they got, and what price they are willing to accept. If any buyers and sellers match up, their orders are executed, money and shares are exchanged, everyone is happy. So the current asking price (the price you have to pay, to get some shares) is currently 12.46$. Let's say you want 6000 shares, for any price. The orderbook now looks like this: Your order is executed, you get 6000 shares for a total of 74,761$ (5900 * 12,46 + 100 * 12,47$). The order book now looks like this: The new asking price is 12.47$. Congrats, you knew the price in advance. Of course this is simplified, there are millions of entries on both sides, thousands of trades happen every millisecond and you'll have to pay the stock exchange a lot of money to give you all this information in real time.  That's what high frequency traders are doing. They use highly specialised computer systems to exploit differences in stock exchanges all over the world. It's called arbitage. They have to be faster than the other guy. This race has gone on for a few years now, so that the limiting factor starts to become the speed of light. YOU are not going to benefit, or else you would not be asking questions on PERSONAL finance :) "Generally, a share of stock entitles the owner to all future per-share dividends paid by the company, plus a fraction of the company's assets net value in the event of liquidation.  If one knew in advance the time and value of all such payouts, the value of the stock should equal the present cash value of that payout stream, which would in turn be the sum of the cash values of all the individual payouts. As time goes by, the present cash value of each upcoming payout will increase until such time as it is actually paid, whereupon it will cease to contribute to the stock's value. Because people are not clairvoyant, they generally don't know exactly what future payouts a stock is going to make.  A sane price for a stock, however, may be assigned by estimating the present cash value of its future payments.  If unfolding events would cause a reasonable person to revise estimates of future payments upward, the price of the stock should increase.  If events cause estimates to be revised downward, the price should fall. In a sane marketplace, if the price of a stock is below people's estimates of its payouts' current cash value, people should buy the stock and push the price upward.  If it is above people's estimates, they should sell the stock and push the price downward.  Note that in a sane marketplace, rising prices are a red-flag indicator for people to stop buying.  Unfortunately, sometimes bulls see a red flag as a signal to charge ahead.  When that happens, prices may soar through the roof, but it's important to note that the value of the stock will still be the present cash value of its future payouts.  If that value is $10/share, someone who buys a share for $50 basically gives the seller $40 that he was not entitled to, and which the buyer will never get back.  The buyer might manage to convince someone else to pay him $60 for the share, but that simply means the new buyer is giving the the previous one $50 that he wasn't entitled to either.  If the price falls back to $10, calling that fall a ""market correction"" wouldn't be a euphemism, but rather state a fact: the share was worth $10 before people sold it for crazy prices, and still worth $10 afterward.  It was the market price that was in error. The important thing to focus on as a sane investor is what the stock is actually going to pay out in relation to what you put in.  It's not necessary to look only at present price/earnings ratios, since some stocks may pay little or nothing today but pay handsomely next year.  What's important, however, is that there be a reasonable likelihood that in the foreseeable future the stock will pay dividends sufficient to justify its cost." "I think for this a picture is worth a thousand words.  This is a ""depth chart"" that I pulled from google images, specifically because it doesn't name any security.  On the left you have all of the ""bids"" to buy this security, on the right you have the ""asks"" to sell the security.  In the middle you have the bid/ask spread, this is the space between the highest bid and the lowest ask.  As you can see you are free to place you order to the market to buy for 232, and someone else is free to place their order to the market to sell for 234.  When the bid and the ask match there's a transaction for the maximum number of available shares.  Alternatively, someone can place a market order to buy or sell and they'll just take the current market price. Retail investors don't really get access to this kind of chart from their brokers because for the most part the information isn't terribly relevant at the retail level." The quotes on JSE are for 100 share lots.  The quotes on NYSE are for single shares.  That still leaves some price difference, but much less than you calculated. (EDIT: Equivalently, the price is quoted in 1/100th of a Rand.  The Reuter's listing makes this explicit since the price is listed as ZAc rather than ZAR.  http://www.reuters.com/finance/stocks/overview?symbol=HARJ.J) As noted in the other answer currently up, NYSE is quoting American Depositary Receipts (ADRs) for this company, which is not directly its stock.  The ADR in this case, if you check the prospectus, is currently 1 share of the ADR = 1 share of the stock on its home market.  A US institution (in this case it looks like BNY Mellon) is holding shares of stock to back each ADR. Arbitrage is possible and does happen.  It's not perfect though, because there are a variety of other cost and risk factors that need to be considered.  There's a good review here: Report by JP Morgan Some summary points: "The value of a stock ultimately is related to the valuation of a corporation.  As part of the valuation, you can estimate the cash flows (discounted to present time) of the expected cash flows from owning a share.  This stock value is the so-called ""fundamental"" value of a stock.  What you are really asking is, how is the stock's market price and the fundamental value related?  And by asking this, you have implicitly assumed they are not the same.   The reason that the fundamental value and market price can diverge is that simply, most shareholders will not continue holding the stock for the lifespan of a company (indeed some companies have been around for centuries).  This means that without dividends or buybacks or liquidations or mergers/acquisitions, a typical shareholder cannot reasonably expect to recoup their share of the company's equity. In this case, the chief price driver is the aggregate expectation of buyers and sellers in the marketplace, not fundamental evaluation of the company's balance sheet.   Now obviously some expectations are based on fundamentals and expert opinions can differ, but even when all the experts agree roughly on the numbers, it may be that the market price is quite a ways away from their estimates.  An interesting example is given in this survey of behavioral finance.  It concerns Palm, a wholly-owned subsidiary of 3Com.  When Palm went public, its shares went for such a high price, they were significantly higher than 3Com's shares.  This mispricing persisted for several weeks. Note that this facet of pricing is often given short shrift in standard explanations of the stock market.  It seems despite decades of academic research (and Nobel prizes being handed out to behavioral economists), the knowledge has been slow to trickle down to laymen, although any observant person will realize something is amiss with the standard explanations.   For example, before 2012, the last time Apple paid out dividends was 1995.  Are we really to believe that people were pumping up Apple's stock price from 1995 to 2012 because they were waiting for dividends, or hoping for a merger or liquidation?  It doesn't seem plausible to me, especially since after Apple announced dividends that year, Apple stock ended up taking a deep dive, despite Wall Street analysts stating the company was doing better than ever.  That the stock price reflects expectations of the future cash flows from the stock is a thinly-disguised form of the Efficient Market Hypothesis (EMH), and there's a lot of evidence contrary to the EMH (see references in the previously-linked survey).  If you believe what happened in Apple's case was just a rational re-evaluation of Apple stock, then I think you must be a hard-core EMH advocate. Basically (and this is elaborated at length in the survey above), fundamentals and market pricing can become decoupled.  This is because there are frictions in the marketplace making it difficult for people to take advantage of the mispricing.  In some cases, this can go on for extended periods of time, possibly even years.  Part of the friction is caused by strong beliefs by market participants which can often shift pressure to supply or demand.  Two  popular sayings on Wall Street are, ""It doesn't matter if you're right.  You have to be right at the right time.""  and ""It doesn't matter if you're right, if the market disagrees with you.""  They suggest that you can make the right decision with where to put your money, but being ""right"" isn't what drives prices.  The market does what it does, and it's subject to the whims of its participants." The company's value (which should be reflected in the share price) is not how much money it has in the bank, but something along the lines of 'how much money will it make between now and the end of times' (adjusted for time value of money and risk). So when you purchase a share of a company that has, say, little money in the bank, but expects to make 1M$ profit this year, 2M$ for the following 3 years, and say, nothing after, you are going to pay your fraction of 7M$ (minus some discount because of the risk involved). If now they announce that their profits were only 750k$, then people may think that the 2M$ are more likely to be 1.5M$, so the company's value would go to ~ 5M$. And with that, the market may perceive the company as more risky, because its profits deviated from what was expected, which in turn may reduce the company's value even further. Thank you for replying. I'm not sure I totally follow though, aren't you totally at mercy of the liquidity in the stock? I guess I'm havinga hard time visualizing the value a human can add as opposed to say vwapping it or something. I can accept that you're right, just having a difficult time picturing it That is called a 'volume chart'. There are many interactive charts available for the purpose. Here is clear example.  (just for demonstration but this is for India only) 1) Yahoo Finance 2) Google Finance 3) And many more Usually, the stock volume density is presented together (below it) with normal price vs time chart. Note: There is a friendly site about topics like this. Quant.stackexchange.com. Think of checking it out. id like to start by saying youre still doing this yourself, and i dont actually have all the info required anyway, dont send it but  &gt;[3] Descriptive Statistical Measures: Provide a thorough discussion of the meaning and interpretation of the four descriptive &gt;statistical measures required in your analysis: (1) Arithmetic Mean, (2) Variance, (3) Standard Deviation and (4) Coefficient of &gt;Variation. For example, how are these measures related to each other? In order to develop this discussion, you may want to &gt;consult chapters 2 and 3 of your textbook. This topic is an important part of your report. can be easily interpreted, im guessing the mean is simply just the observed (and then projected stock price for future models) the standard deviation determines the interval in which the stock price fluctuates. so you have like a curve, and then on this curve theirs a bunch of normal distributions modeling the variance of the price plotted against the month  also the coefficient of variation is just r^2 so just read up on that and relate it to the meaning of it to the numbers you have  actually my stats are pretty rusty so make sure you really check into these things  but otherwise the formulas for part 4 is simple too. you can compare means of a certain month using certain equations, but there are different ones for certain situations  you can test for significance by comparing the differences of the means and if its outside of your alpha level then it probably means your company is significantly different from the SP index. (take mu of SP - mu of callaway)  you can also find more info on interpreting the two different coefficients your given if you look up comparing means of linear regression models or something While there are lots of really plausible explanations for why the market moves a certain way on a certain day, no one really knows for sure.  In order to do that, you would need to understand the 'minds' of all the market players.  These days many of these players are secret proprietary algorithms.  I'm not quibbling with the specifics of these explanations (I have no better) just pointing out that these are just really hypotheses and if the market starts following different patterns, they will be tossed into the dust bin of 'old thinking'. I think the best thing you can explain to your son is that the stock market is basically a gigantic highly complex poker game.  The daily gyrations of the market are about individuals trying to predict where the herd is going to go next and then after that and then after that etc. If you want to help him understand the market, I suggest two things.  The first is to find or create a simple market game and play it with him.  The other would be to teach him about how bonds are priced and why prices move the way they do.  I know this might sound weird and most people think bonds are esoteric but there are bonds have a much simpler pricing model based on fundamental financial logic.  It's much easier then to get your head around the moves of the bond markets because the part of the price based on beliefs is much more limited (i.e. will the company be able pay & where are rates going.)  Once you have that understanding, you can start thinking about the different ways stocks can be valued (there are many) and what the market movements mean about how people are valuing different companies. With regard to this specific situation, here's a different take on it from the 'priced in' explanation which isn't really different but might make more sense to your son: Pretend for a second that at some point these stocks did move seasonally.  In the late fall and winter when sales went up, the stock price increased in kind.  So some smart people see this happening every year and realize that if they bought these stocks in the summer, they would get them cheap and then sell them off when they go up.  More and more people are doing this and making easy money.  So many people are doing it that the stock starts to rise in the Summer now.  People now see that if they want to get in before everyone else, they need to buy earlier in the Spring.  Now the prices start rising in the Spring.  People start buying in the beginning of the year... You can see where this is going, right?  Essentially, a strategy to take advantage of well known seasonal patterns is unstable.  You can't profit off of the seasonal changes unless everyone else in the market is too stupid to see that you are simply anticipating their moves and react accordingly.