Would every FX currency pair or public stock that is under the 30 level using Relative Strength Index (RSI) be an undervalued pair?
No, and using a 37 year old formula in finance that is as simple as: should make it obvious technical analysis is more of a game for retail traders than investment advice. When it comes to currencies, there are a myriad of macroeconomic occurrences that do not follow a predictable timescale. Using indicators like RSI on any time frame will not magically illuminate broad human psychology and give you an edge. It is theoretically possible for a single public stock's price to be driven by a range of technical traders who all buy at RSI 30 and sell at RSI 70, after becoming a favorite stock on social media, but it is infinitely more likely for all market participants to have completely different goals. No. The long-term valuation of currencies has to do with Purchasing Power Parity.  The long-term valuation of stocks has to do with revenues, expenses, market sizes, growth rates, and interest rates. In the short term, currency and stock prices change for many reasons, including interest rate changes, demand for goods and services, asset price changes, political fears, and momentum investing.  In any given time window, a currency or stock might be: The Relative Strength Index tries to say whether a currency or stock has recently been rising or falling; it does not inherently say anything about whether the current value is high or low.
"It is not clear to me why you believe you can lose more than you put in, without margin. It is difficult and the chances are virtually nil. However, I can think of a few ways. Lets say you are an American, and deposit $1000. Now lets say you think the Indian rupee is going to devalue relative to the Euro. So that means you want to go long EURINR. Going long EURINR, without margin, is still different than converting your INRs into Euros. Assume USDINR = 72. Whats actually happening is your broker is taking out a 72,000 rupee loan, and using it to buy Euros, with your $1000 acting as collateral. You will need to pay interest on this loan (about 7% annualized if I remember correctly). You will earn interest on the Euros you hold in the meantime (for simplicity lets say its 1%). The difference between interest you earn and interest you pay is called the cost of carry, or commonly referred to as 'swap'. So your annualized cost of carry is $60 ($10-$70). Lets say you have this position open for 1 year, and the exchange rate doesnt move. Your total equity is $940. Now lets say an asteroid destroys all of Europe, your Euros instantly become worthless. You now must repay the rupee loan to close the trade, the cost of which is $1000 but you only have $940 in your account. You have lost more than you deposited, using ""no margin"". I would actually say that all buying and selling of currency pairs is inherently using margin, because they all involve a short sale. I do note that depending on your broker, you can convert to another currency. But thats not what forex traders do most of the time." "Bob should treat both positions as incomplete, and explore a viewpoint which does a better job of separating value from volatility. So we should start by recognizing that what Bob is really doing is trading pieces of paper (say Stocks from Fund #1 or Bonds from Fund #2, to pick historically volatile and non-volatile instruments.*) for pieces of paper (Greenbacks).  In the end, this is a trade, and should always be thought of as such.  Does Bob value his stocks more than his bonds?  Then he should probably draw from Fund #2.  If he values his bonds more, he should probably draw from Fund #1. However, both Bob and his financial adviser demonstrate an assumption: that an instrument, whether stock bond or dollar bill, has some intrinsic value (which may raise over time).  The issue is whether its perceived value is a good measure of its actual value or not. From this perspective, we can see the stock (Fund #1) as having an actual value that grows quickly (6.5% - 1.85% = 4.65%), and the bond (Fund #2) as having an actual value that grows slower (4.5% - 1.15$ = 3.35$).  Now the perceived value of the stocks is highly volatile.  The Chairman of the Fed sneezes and a high velocity trader drives a stock up or down at a rate that would give you whiplash. This perspective aligns with the broker's opinion.  If the stocks are low, it means their perceived value is artificially low, and selling it would be a mistake because the market is perceiving those pieces of paper as being worth less than they actually are.  In this case, Bob wins by keeping the stocks, and selling bonds, because the stocks are perceived as undervalued, and thus are worth keeping until perceptions change. On the other hand, consider the assumption we carefully slid into the argument without any fanfare: the assumption that the actual value of the stock aligns with its historical value.  ""Past performance does not predict future results.""  Its entirely possible that the actual value of the stocks is actually much lower than the historical value, and that it was the perceived value that was artificially higher.  It may be continuing to do so... who knows how overvalued the perceived value actually was!  In this case, Bob wins by keeping the bonds.  In this case, the stocks may have ""underperformed"" to drive perceptions towards their actual value, and Bob has a great chance to get out from under this market. The reality is somewhere between them.  The actual values are moving, and the perceived values are moving, and the world mixes them up enough to make Scratchers lottery tickets look like a decent investment instrument.  So what can we do? Bob's broker has a smart idea, he's just not fully explaining it because it is unprofessional to do so.  Historically speaking, Bobs who lost a bunch of money in the stock market are poor judges of where the stock market is going next (arguably, you should be talking to the Joes who made a bunch of money. They might have more of a clue.).  Humans are emotional beings, and we have an emotional instinct to cut ties when things start to go south.  The market preys on emotional thinkers, happily giving them what they want in exchange for taking some of their money.  Bob's broker is quoting a well recognized phrase that is a polite way of saying ""you are being emotional in your judgement, and here is a phrasing to suggest you should temper that judgement."" Of course the broker may also not know what they're doing!  (I've seen arguments that they don't!)  Plenty of people listened to their brokers all the way to the great crash of 2008.  Brokers are human too, they just put their emotions in different places.  So now Bob has no clear voice to listen to.  Sounds like a trap! However, there is a solution.  Bob should think about more than just simple dollars.  Bob should think about the rest of his life, and where he would like the risk to appear.  If Bob draws from Fund #1 (liquidating stocks), then Bob has made a choice to realize any losses or gains early... specifically now.  He may win, he may lose.  However, no matter what, he will have a less volatile portfolio, and thus he can rely on it more in the long run. If Bob draws from Fund #2 (liquidating bonds) instead, then Bob has made a choice not to realize any losses or gains right away.  He may win, he may lose.  However, whether he wins or loses will not be clear, perhaps until retirement when he needs to draw on that money, and finds Fund #1 is still under-performing, so he has to work a few more years before retirement.  There is a magical assumption that the stock market will always continue rewarding risk takers, but no one has quite been able to prove it! Once Bob includes his life perspective in the mix, and doesn't look just at the cold hard dollars on the table, Bob can make a more educated decision.  Just to throw more options on the table, Bob might rationally choose to do any one of a number of other options which are not extremes, in order to find a happy medium that best fits Bob's life needs: * I intentionally chose to label Fund #1 as stocks and Fund #2 as bonds, even though this is a terribly crude assumption, because I feel those words have an emotional attachment associated to them which #1 and #2 simply do not.  Given that part of the argument is that emotions play a part, it seemed reasonable to dig into underlying emotional biases as part of my wording.  Feel free to replace words as you see fit to remove this bias if desired." A currency that is strong right now is one that is expensive for you to buy. The perfect one would be a currency that is weak now but will get stronger; the worst currency is one that is strong today and gets weak. If a currency stays unchanged it doesn't matter whether it is weak or strong today as long as it doesn't get weaker / stronger. (While this advice is correct, it is useless for investing since you don't know which currencies will get weaker / stronger in the future).  Investing in your own currency means less risk. Your local prices are usually not affected by currency change. If you safe for retirement and want to retire in a foreign country, you might consider in that country's currency. I still can't understand why there is a price discrepancancy.  There isn't. It's the same stock and price differences between such major exchanges will always be minimal. I think you simply haven't paid attention to the date range. It seems Google finance only has data for FRA:BMW reaching back to 2011, so if you try to look at the development of your investment since 2009, you're not getting comparable data. "In practice, most (maybe all) stock indices are constructed by taking a weighted average of stock prices denominated in a single currency, and so the index implicitly does have that currency - as you suggest, US dollars for the S&P 500. In principle you can buy one ""unit"" of the S&P 500 for $2,132.98 or whatever by buying an appropriate quantity of each of its constituent stocks. Also, in a more realistic scenario where you buy an index via a tracker fund, you would typically need to buy using the underlying currency of the index and your returns will be relative to that currency - if the index goes up by 10%, your original investment in dollars is up by 10%." The value of the asset doesn't change just because of the exchange rate change. If a thing (valued in USD) costs USD $1 and USD $1 = CAN $1 (so the thing is also valued CAN $1) today and tomorrow CAN $1 worth USD $0.5 - the thing will continue being worth USD $1. If the thing is valued in CAN $, after the exchange rate change, the thing will be worth USD $2, but will still be valued CAN $1. What you're talking about is price quotes, not value. Price quotes will very quickly reach the value, since any deviation will be used by the traders to make profits on arbitrage. And algo-traders will make it happen much quicker than you can even notice the arbitrage existence. Have you looked at ThinkorSwim, which is now part of TD Ameritrade? Because of their new owner, you'll certainly be accepted as a US customer and the support will likely be responsive. They are certainly pushing webinars and learning resources around the ThinkorSwim platform. At the least you can start a Live Help session and get your answers. That link will take you to the supported order types list. Another tab there will show you the currency pairs. USD is available with both CAD and JPY. Looks like the minimum balance requirement is $25k across all ThinkorSwim accounts. Barron's likes the platform and their annual review may help you find reasons to like it. Here is more specific news from a press release: OMAHA, Neb., Aug 24, 2010 (BUSINESS   WIRE) -- TD AMERITRADE Holding   Corporation (NASDAQ: AMTD) today   announced that futures and spot forex   (foreign exchange) trading   capabilities are now available via the   firm's thinkorswim from TD AMERITRADE   trading platform, joining the recently   introduced complex options   functionality. This can arise with very thinly traded stocks for large blocks of shares. If the market only has a few thousand dollars available at between 8.37 and 12.5 the price is largely meaningless for people who want to invest in hundreds of thousands/millions of dollars worth, as the quoted price can't get them anywhere near the number of shares they want. How liquid is the stock in question? fibonacci levels (retracements,expansions, arcs) are all arbitrary numbers with no statistical significance. that said thousands of traders world over use, view and depend on fib numbers in their trading ranging from forex, stock commodities etc the point is if it's traded a fibonacci number has been used on it, because of this unanimity on their significance & application the fibonacci's thus act as valid anchors since so many traders are looking at the same levels (self-fulfilling prophecy). the values of the fib numbers are all equally significant i.e the 23.6. 38.2, 50, or 61.8 are statistically all equally likely to occur. you just have to be vigilant as your trade approaches the fib levels. "Of course, which is why you need to have a scoring function / utility function for the ""filters"", i.e. Are you going to value it by rate of accuracy hor by a metric where wins = +2, losses = -1, such that it uses a criteria like that to decide whether or not a filter adds value, (some even use a compound effect i.e. wins = 2+e^(1+w) where w is the consecutive wins).  A metric like the above would capture the trade off between predictive power and profit. Also some traders watch their Max DD very carefully so they may be very risk averse." There are several camps for stock valuation, and much of it boils down to your investment style.  A growth investor will not consider something with a 50x P/E ratio to be overvalued, but a value investor certainly would. I would recommend looking up the Fama-French n-factor model (it was 3-factor, I believe they have released newer papers which introduce other factors), and reading The Intelligent Investor by Benjamin Graham.  Graham's methodology is practically canon for many investors, and the methodology focuses on value, while outlining quantitative factors for determining if a stock is under or over valued. "Wikipedia talks about the Chinese currency: Scholarly studies suggest that the yuan is undervalued on the basis of purchasing power parity analysis. so despite it appearing cheaper due to the official exchange rate, the price in China might actually be fair. There are also restrictions on foreign exchange (purportedly ""to prevent inflows of hot money""), which, in concert with any other legal obstacles to owning or trading on the Chinese exchange, may also explain why the high-frequency traders aren't tripping over each other to arbitrage away the difference." Fx Pip partnership Limited is a reliable trading signal and consultancy provider with many years of experience and significant success in the field of investments. 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It provides signals which suits almost all the market around the world.It has four packages named Trial, Standard, Premium, Premium Plus. It has well organised support team to provide 24/7 live support and forex consultancy to gain meaningful profit. It believes in transperancy , relaibility and accuracy. All the signals are provided in a flexible way so that the subscribers can easily execute them and their desire profit. Fx Pip Signal is available in almost all the countries of the world. It provides signals via sms, email and updated in the website. "For the S&P and many other indices (but not the DJIA) the index ""price"" is just a unitless number that is the result of a complicated formula.  It's not a dollar value.  So when you divide said number by the earnings/share of the sector, you're again getting just a unitless number that is incomparable to standard P-E ratios. In fact, now that I think about, it kinda makes sense that each sector would have a similar value for the number that you're computing, since each sector's index formula is presumably written to make all the index ""price""s look similar to consumers." "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."