Difference between full and mini futures contract
Both of these are futures contracts on the Ibovespa Brasil Sao Paulo Stock Exchange Index; the mini being exactly that, a mini version (or portion) of the regular futures contract. The mini counterpart makes trading the index more affordable to individual investors and hence increase liquidity.
ES1 is the Bloomberg symbol for the CME E-mini S&P 500 front-month continuous contract.  ES2, ES3, etc. will likewise yield the 2nd and 3rd months.  Which exact futures contract this symbol refers to will change about once a month. In India the only way to short a stock is using F&O which I personally find to be sufficient for any shorting needs. However, Futures can be generally sold for upto 3 months but options have more choices which are even upto 5 years you can buy a put of a longer duration and when you want to do buy-back, you can directly sell the same option by squaring-off the trade before expiry date. You generally get approximately the same profit as shorting but you get to limit your risk. Standard options are contracts for 100 shares. If the option is for $0.75/share and you are buying the contract for 100 shares the price would be $75 plus commission. Some brokers have mini options available which is a contract for 10 shares. I don't know if all brokers offer this option and it is not available on all stocks. The difference between the 1 week and 180 day price is based on anticipated price changes over the given time. Most people would expect more volatility over a 6 month period than a 1 week period thus the demand for a higher premium for the longer option. "The difference between TMUSP and TMUS is that the ""with P"" ticker is for a TMobile Preferred Stock offering.  The ""without P"" ticker is for TMobile common stock.  The difference between the apparent percentage yields is due to Yahoo! Stock misreporting the dividend on the preferred stock for the common stock, which has not paid a dividend (thanks Brick for pointing this out!) Preferred stock holders get paid first in the event of liquidation, in most scenarios they get paid first.  They sometimes get better returns.  They typically lack voting rights, and after a grace period, they may be recalled by the company at a fixed price (set when they were issued). Common stock holders can vote to alter the board of directors, and are the epitome of the typical ""I own a trivial fraction of the company"" model that most people think of when owning stocks. As the common stock is valued at much less, it appears that the percent yield is much higher, but in reality, it's 0%." The futures market allows you to take delivery at the lowest cost.  Most people don't deal in 100oz gold bars and 5000oz of 1000oz silver bars though, especially at the retail level.  That said, when you are at the retail level, often times you will find reputable Internet dealers offering the lowest cost of ownership.  Keep in mind brand name though when you're doing this.  Reputable refiners/mints will often see higher premiums versus generic, and this does matter to some extent. Quantity and weights also matter in terms of pricing; the more you buy the lower the premium. "Consider the futures market. Traders buy and sell gold futures, but very few contracts, relatively speaking, result in delivery. The contracts are sold, and ""Open interest"" dwindles to near zero most months as the final date approaches. The seller buys back his short position, the buyer sells off his longs.  When I own a call, and am 'winning,' say the option that cost me $1 is now worth $2, I'd rather sell that option for even $1.95 than to buy 100 shares of a $148 stock. The punchline is that very few option buyers actually hope to own the stock in the end. Just like the futures, open interest falls as expiration approaches." I work on a buy-side firm, so I know how these small data issues can drive us crazy. Hope my answer below can help you:  Reason for price difference: 1. Vendor and data source Basically, data providers such as Google and Yahoo redistribute EOD data by aggregating data from their vendors. Although the raw data is taken from the same exchanges, different vendors tend to collect them through different trading platforms. For example, Yahoo, is getting stock data from Hemscott (which was acquired by Morningstar), which is not the most accurate source of EOD stocks. Google gets data from Deutsche Börse.  To make the process more complicated, each vendor can choose to get EOD data from another EOD data provider or the exchange itself, or they can produce their own open, high, low, close and volume from the actual trade tick-data, and these data may come from any exchanges.  2. Price Adjustment  For equities data, the re-distributor usually adjusts the raw data by applying certain customized procedures. This includes adjustment for corporate actions, such as dividends and splits. For futures data, rolling is required, and back-ward and for-warding rolling can be chosen. Different adjustment methods can lead to different price display.  3. Extended trading hours  Along with the growth of electronic trading, many market tends to trade during extended hours, such as pre-open and post-close trading periods. Futures and FX markets even trade around the clock. This leads to another freedom in price reporting: whether to include the price movement during the extended trading hours.   Conclusion To cross-verify the true price, we should always check the price from the Exchange where the asset is actually traded. Given the convenience of getting EOD data nowadays, this task should be easy to achieve.  In fact, for professional traders and investors alike, they will never reply price on free providers such as Yahoo and Google, they will most likely choose Bloomberg, Reuters, etc. However, for personal use, Yahoo and Google should both be good choices, and the difference is small enough to ignore. "Very interesting. I'm actually glad you mentioned term structure models, because that's something I'm interested in. But I don't think the distinction you draw between ""equilibrium"" and ""arbitrage free"" models makes sense with Black-Scholes.  My understanding was that the discrepancy between equilibrium and arbitrage-free term structure models arises because term structure models lack market completeness. In other words, when the market is incomplete (as it is with interest rates), you'll have a continuum of bond prices that are compatible with no arbitrage, and the exact price will depend on the market price for risk.   However, in Black-Scholes, the market price for risk term basically falls out of the equation because of market completeness. Or in other words, since we have market completeness, there's a *unique* martingale measure that gives the price for the option. So when you have market completeness, there should be no difference between an equilibrium and a no-arbitrage model - they're one and the same." a) Contracts are for future delivery of said underlying. So if you are trading CL (crude oil) futures and don't sell before delivery date, you will be contacted about where you want the oil to be delivered (a warehouse presumably). 1 contract is the equivalent of 1000 barrels. b) 600 contracts depends entirely on what you are trading and how you are trading. If you are trading ES (S&P 500 e-Mini), you can do the 600 contracts in less than a second. c) No fees does not make particular sense. It's entirely possible that you are not trading anything, it's just a fake platform so they can judge your performance. d) The catch typically is that when it's time to pay you, they will avoid you or worst case, disappear. e) Trading is a full-time job, especially for the first 4-5 years when you're only learning the basics. Remember, in futures trading you are trading against all the other professionals who do only this 24/7 for decades. If you are only risking your time with the reward being learning and possibly money, it seems like a good deal. There's typically a catch with these things - like you would have to pay for your data which is very expensive or withdrawing funds is possible only months later. Brokers usually have this kind of information, you can take a look at interactive brokers for instance: http://www.interactivebrokers.co.uk/contract_info/v3.6/index.php?action=Details&site=GEN&conid=90384435 You are interested in the initial margin which in this case is $6,075. So you need that amount to buy/sell 1 future. In the contract specification you see the contract is made for 100 ounces. At the current price ($1,800/oz), that would be a total of $180,000. It is equivalent to saying you are getting 30x leverage. If you buy 1 future and the price goes from $1,800 to $1,850, the contract would go from $180,000 to $185,000. You make $5,000 or a 82% return. I am pretty sure you can imagine what happens if the market goes against you.  Futures are great! (when your timing is perfect). See http://blogs.reuters.com/felix-salmon/2011/04/30/why-the-sec-should-look-at-levered-etfs/?dlvrit=60132, http://symmetricinfo.org/2011/04/are-investors-in-levered-short-treasury-etfs-a-disaster-waiting-to-happen-pt1/, and the articles linked from it: The issue with holding a levered ETF past 1 day is that investors expose themselves to path dependency in the underlying.... The reason for the difference in payouts comes from the fact that the manager of the levered ETF promises you a multiple of the daily returns of the underlying. To be able to promise you these daily returns, the ETF manager has to buy/sell some of the underlying every day to position himself to have a constant leverage ratio the next day. The short video below explains this process in detail for a 2x long ETF, but the same result holds for a 2x short ETF: the manager has to buy more of the underlying on a day when the underlying increases in value and sell more of the underlying when the underlying goes down in value . The owner of a long futures contract does not receive dividends, hence this is a disadvantage compared to owning the underlying stock. If the dividend is increased, and the future price would not change, there is an arbitrage possibility. For the sake of simplicity, assume that the stock suddenly starts paying a dividend, and that the risk free rate is zero (so interest does not play a role). One can expect that the future price is (rougly) equal to the stock price before the dividend announcment. If the future price would not change, an investor could buy the stock, and short a futures contract on the stock. At expiration he has to deliver the stock for the price set in the contract, which is under the assumptions here equal to the price he bought the stock for. But because he owned the stock, he receives the announced dividend. Hence he can make a risk-free profit consisting of the divivends. If interest do play a role, the argument is similar. In India, as suggested above, short/long position can be taken either in F&O or Spot market. The F&O segment short/long can be kept open for appx. 3 months by taking position on the far contract. In intra-day/Spot market, usually the position has to be squared at the end of day or the broker will square it during expiry (forcibly). However, having said that, it is a broker specific feature, as per National Stock Exchange (NSE) or Bombay Stock Exchange (BSE) any transaction has to be settled at the end of T+2 days (T being the trade day). Some brokers allow intra-day positions to be open for T+1 or T+2 days as long as the margin is provided. This is a broker specific discretion as the actual settlement is on T+2 (or in some cases as the exchange specifies). So, in general, to short a stock for a longer time, F&O segment should be used. The amount stated is the total amount of money the customer will be paying to the company. How much profit that will translate into is dependent on the type of contract.  Some types of contracts: Cost plus fixed fee: they are paid what it costs to complete the contract plus a fee on top of that. That fee represents their profits. The costs will include salary, benefits, overhead, equipment, supplies. Firm fixed price: They perform the service, and they get paid a fixed amount. If their costs are higher than they forecast, then they may lose money. If they can be more efficient than they forecast, then they make more money. Time and materials: They are paid for completing each sub-task based on the number of hours it takes to complete each sub task, plus materials. This is used to hire a company to maintain a fleet of trucks. If the trucks are used a lot they will need more standard maintenance, plus additional repairs based on the type of use. They pay X for labor and Y for materials for an oil change, but A for labor and B for materials for a complete engine rebuild.  There are many variations on these themes. Some put the risk on the customer, some on the company.  How and when the company is paid is based on the terms of the contract. Some pay X% a month, others pay based on meeting milestones. Some pay based on the number of tasks completed in each time period. Some contracts run for a specific period of time, others have an initial period plus option years. The article may or may not specify if the quoted amount is the minimum amount of the contract or the maximum amount. The impact on the stock price is much more complex. Much more needs to be known about the structure of the contract, and who will be providing the service to determine if there will be profits. Some companies will bid to lose money, if it will serve as a bridge to another contract or to fill a gap that will allow them to delay layoffs. Difference between a limit and market order is largely a trade-off between price certainty and timing certainty. If you think the security is already well priced, the downside of a limit order is the price may never hit your limit and keep trading away from you. You'll either spend a lot of time amending your order or sitting around wishing you'd amended your order.  The downside of a market order is you don't know the execution price ahead of time. This is typically more of a issue with illiquid instruments where even smaller orders may have price impact. For small trades in more liquid securities your realized price will often resemble the last traded price. Hope that helps. Both have a purpose, and the best tool for the job will depend on your circumstances.