Brent crude vs. USD market value
I don't think the two are particularly linked.  While Brick is right in that the price of oil is denominated in dollars, I don't think that's responsible for most of the movement here. Oil has been weak for intrinsic reasons related to oil: supply/demand imbalance, largely.  (Oil also was way over-priced back when it was > $100 a barrel; a lot of that was due to worries about instability in the Middle East.) The dollar has been strong for other, separate intrinsic reasons.  The American economy has had a stronger rebound than Europe or Asia; while we were hit hard in the 2008 recession, we rebounded pretty quickly from a whole-economy point of view (we still have a lot of weaknesses in terms of long-term unemployment, but that doesn't seem to be hurting our productivity much).   Pick another time period, and you won't necessarily see the same matching path (and I would even say that those paths don't match particularly well).  Marketwatch covered this for example; other sites show similar things.  There is a weak correlation, but only in the short term, or for specific reasons. "It's standard to price oil in US$.  That means that if the US$ gets stronger, the prices of oil drops even if its ""intrinsic value"" remains constant.  Same thing happens for other commodities, such as gold.  Think of the oil price in barrels/$.  If the denominator (value of the $) goes up, then the ratio tends to go down."
"As I stated in my comment, options are futures, but with the twist that you're allowed to say no to the agreed-on transaction; if the market offers you a better deal on whatever you had contracted to buy or sell, you have the option of simply letting it expire. Options therefore are the insurance policy of the free market. You negotiate a future price (actually you usually take what you can get if you're an individual investor; the institutional fund managers get to negotiate because they're moving billions around every day), then you pay the other guy up front for the right of refusal later. How much you pay depends on how likely the person giving you this option is to have to make good on it; if your position looks like a sure thing, an option's going to be very expensive (and if it's such a sure thing, you should just make your move on the spot market; it's thus useful to track futures prices to see where the various big players are predicting that your portfolio will move). A put option, which is an option for you to sell something at a future price, is a hedge against loss of value of your portfolio. You can take one out on any single item in your portfolio, or against a portion or even your entire portfolio. If the stock loses value such that the contract price is better than the market price as of the delivery date of the contract, you execute the option; otherwise, you let it expire. A call option, which is an option to buy something at a future price, is a hedge against rising costs. The rough analog is a ""pre-order"" in retail (but more like a ""holding fee""). They're unusual in portfolio management but can be useful when moving money around in more complex ways. Basically, if you need to guarantee that you will not pay more than a certain per-share price to buy something in the future, you buy a call option. If the spot price as of the delivery date is less than the contract price, you buy from the market and ignore the contract, while if prices have soared, you exercise it and get the lower contract price. Stock options, offered as benefits in many companies, are a specific form of call option with very generous terms for whomever holds them. A swaption, basically a put and a call rolled into one, allows you to trade something for something else. Call it the free market's ""exchange policy"". For a price, if a security you currently hold loses value, you can exchange it for something else that you predicted would become more valuable at the same time. One example might be airline stocks and crude oil; when crude spikes, airline stocks generally suffer, and you can take advantage of this, if it happens, with a swaption to sell your airline stocks for crude oil certificates. There are many such closely-related inverse positions in the market, such as between various currencies, between stocks and commodities (gold is inversely related to pretty much everything else), and even straight-up cash-for-bad-debt arrangements (credit-default swaps, which we heard so much about in 2008)." Generally, you need something that goes up over time during periods of index decline, but otherwise holds some value.  Historically, people tend to use gold for that purpose.  But with gold also set up for possible declines, that raises questions.  Silver has dropped a bit more than gold in terms of percentages.  If you think the downward motion will be in the form of sudden jumps, you can look at putting some of your money in puts away from the current price, but you can easily wind up paying too much for this protection.   In the case of a deflation, most things lose value vs. money, and you want all cash. These things might already be obvious.  I don't think there is a clear answer to your question.  But if the future were clear, the present market could possibly anticipate and adjust... one reason the future of the market always seems a bit murky. Today the rates are arrived simply on the basis of demand and supply. Historically rates were pegged to Gold, when all currencies were printed depending on the Gold reserves. So if one country printed 100 units of currency of a 1gm of gold and other country 10 units of currency for 1 gm of gold, the rate would be 1:10. However In the seventies with shortages of Gold and other reasons, USD became the default standard, so the rate started being pegged to the USD reserves the countries started maintaining. However later in the early eighties, US backing out, the rate purely started getting pegged to market demand and supply. So for most currencies there was a default rate to begin with and today its changed ... Incase of USD/EUR, the initial rate was determined by the weighted average of the currencies that it sought to replace. After that its been market supply and demand. Since most of the trade in international market is US denominated, largest being Oil, each country has created a huge reserves of USD. So technically if China were to bank half its USD denominated treasury bills, the USD would come crashing down, but then China itself would be at disadvantage as its value of USD its holding would become less and it cannot buy the same items. Hence all countries keep hording USD and this means US if they print more money, the value will not come down, because it that happens, all countries holding USD would loose their value of reserve. In essence a country can print as much as currency it wants if all(majority) its debts and trades are denominated in local currencies. This is 100% true for US and hence it can get away by printing money. This is also true to a large extent for Japan as bulk of its Debts are denominated in JPY. "As someone that works in and with the ag and commodity markets, my understanding, is limited but I hope it helps.   Aside from needing an infrastructure built to maintain the vast amounts of data, communication, pricing, banking information, having a closing time for our markets helps to ensure value and fair trade. Capitalism is centralized around creating a fair value for ventures to sell, where prospective buyers opt to purchase or invest. For example, where I attended university, there were many coffee shops close to campus, but only one stayed open all night, and as such had operational cost much higher than other shops, forcing them to charge more for a cup of coffee. While this example is crude, the idea is the same. By maintaining""bank"" hours, product or strategies and developments meant to increase projected value are allowed to occur.   I imagine that if the markets did not close, my coffee prices would skyrocket for an increased demand, that of which the supply chsin, and farmers, would struggle to meet. The same would be said of grain, salt, oils, etcetera." "I took a course in forex trading for 3 months. I also studied financial markets in the Uni. I have been saving in order to start investing but I face the same question. I have gathered some advantages and disadventages that I would like to know your opinion. Forex market is more liquid, its more easy to identify what makes the currency change and to ""predict"" it. For small investors its an intraday trading. The risk is huge but the return can be also huge. Stocks are for long term investements. Its difficult to have a bigger return unless you know something that others dont. Its more difficult to predict price change since its easier to anyone influence it. The risk is less." "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%." 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. All the members of the team, utilizing in the best way their scientific background and their excellent professionalism, achieve the best results. 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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. "There isn't a single rate that works in both directions.  There are two rates, one for each direction.  So if $1 = 64.23 INR, you may find that 100 INR = $1.55.   In fact, it's even worse than that.  The ""rates"" are just the average values at which transactions occur.  What happens in the real world is that someone (presumably your bank in this instance) offers to sell 100 INR for some amount, perhaps $1.56.  Other traders may either accept this price or refuse to trade.  If they refuse to trade, the bank may accept one of their offers, perhaps $1.55.   Anyway, the answer to your question is that whomever does the actual conversion keeps the ""difference"".  Of course, they may then lose that money if the value falls before they sell.  More confusingly, either your bank or your friend's bank could do the conversion itself.  Either or both could hold balances in various currencies so that they don't have to rely on the vagaries of the exchange market.  This is called a money market account, and banks let their customers invest in them.   It is a bit more likely to be your bank that gets the money than your friend's bank.  Your friend's bank doesn't actually need to know that your account is in USD.  They just transfer the amount in INR.  It's your bank that has to convert that into USD to deposit in your account."