Help me understand Forex in Interactive Brokers
You're confusing open positions and account balance. Your position in GBP is 1000, that's what you've bought. You then used some of it to buy something else, but to the broker you still have an open position of 1000 GBP. They will only close it when you give them the 1000GBP back. What you do with it until then is none of their business. Your account balance (available funds) in GBP is 10.
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For regulatory compliance and rules, you would have to consult your apporiate regulatory body. For a CTA its the NFA/CFTC. You should look at getting licensed to provide crediabilty. For a CTA it would be the series 3 license at the very least and I can provide you with a resource for study guides and practice test taking for ALL licenses.   I can provide a brief step by step guide later on. It is an undeniable fact that 95% of all retail forex traders lose money. In order to break free from this crowd of losing traders we must first understand the forex trading strategies they use. Only then can we learn how to trade forex profitably. "No, I was speaking to boolpies.  His statement was false.  People used the paper for social interaction as well for news.  ""Man Seeking Wife"" and all other manner of people looking for social interactions.  People are so quick to demonize the new and reframe the old as some nostalgic utopia that didn't really exist.  It all boils down to people pining for things they understand and vilifying that which they don't." A lot of questions, but all it boils down to is: . Banks usually perform T+1 net settlements, also called Global Netting, as opposed to real-time gross settlements.  That means they promise the counterparty the money at some point in the future (within the next few business days, see delivery versus payment) and collect all transactions of that kind. For this example say, they will have a net outflow of 10M USD.  The next day they will purchase 10M USD on the FX market and hand it over to the global netter.  Note that this might be more than one transaction, especially because the sums are usually larger. Another Indian bank might have a 10M USD inflow, they too will use the FX market, selling 10M USD for INR, probably picking a different time to the first bank.  So the rates will most likely differ (apart from the obvious bid/ask difference). The dollar rate they charge you is an average of their rate achieved when buying the USD, plus some commission for their forex brokerage, plus probably some fee for the service (accessing the global netting system isn't free). The fees should be clearly (and separately) stated on your bank statement, and so should be the FX rate. Back to the second example: Obviously since it's a different bank handing over INRs or USDs (or if it was your own bank, they would have internally netted the incoming USDs with the outgoing USDs) the rate will be different, but it's still a once a day transaction.  From the INRs you get they will subtract the average FX achieved rate, the FX commissions and again the service fee for the global netting.  The fees alone mean that the USD/INR sell rate is different from the buy rate. Forex is really not that volatile compared to other major asset classes like stocks and commodities. But still markets are generally unencumbered in the major pairs and therefore spikes in volatility can happen. Take what happened with the Swiss Franc a few years ago for example, or GBPUSD recently with news of Brexit. This is less the case with highly regulated currencies like the Chinese Yuan (CNY) Volatility is caused by excessive buy or sell pressure in relation to the available liquidity at the current price. This is usually caused by large buy or sell orders placed with interbank desks by institutions (often including other banks) and central banks. News can also sometimes have a dramatic impact and cause traders to adjust their prices significantly and very quickly. "The prices quoted are for currency pairs traded on the foreign exchange market. For currencies traded on these exchanges, the exchange rates of a given currency pair are determined by the market, so supply and demand, investor confidence, etc. all play a role. EBS and Reuters are the two primary trading platforms in the foreign exchange market, and much of the data on exchange rates comes from them. Websites will usually get their data either from these sources directly or from a data provider that in turn gets it from EBS, Reuters, or another data source like Bloomberg or Haver Analytics. These data sources aren't free, however.  In the US, many contracts, transactions, etc. that involve exchange rates use the exchange rate data published by the Federal Reserve. You might see this in contracts that specify to use ""the exchange rate published by the Federal Reserve at 12 pm (noon) on date --some date--"". You can also look at the Federal Reserve Economic Data, which maintains data series of historical daily, weekly, and monthly exchange rates for major currency pairs. These data are free, although they aren't realtime. Data for each business day is mostly updated the next business day." "My answer is Microsoft Excel.  Google ""VBA for dummies"" (seriously) and find out if your brokerage offers an 'API'.  With a brief understanding of coding you can get a spreadsheet that is live connected to your brokers data stream.  Say you have a spreadsheet with the 1990 value of each in the first two columns (cells a1 and b1).  Maybe this formula could be the third column, it'll tell you how much to buy or sell to rebalance them.   then to iterate the rebalance, set both a2 and b2 to =C1 and drag the formula through row 25, one row for each year.  It'll probably be a little more work than that, but you get the idea."