marginal profit function What should we do now, other than what we have achieved? (2) actual income -- the increase of material wealth; Interest rates have a very important impact on the exchange rate, which is the most important factor affecting the exchange rate. We know that the exchange rate is the relative price between the two countries' currencies. Like other commodity pricing mechanisms, it is determined by the supply and demand relationship in the foreign exchange market. Foreign exchange is a kind of financial asset, which people hold because it can bring the benefits of capital. According to data released on Wednesday by the U.S. energy information administration (EIA), the number of commercial crude stocks removed from strategic reserves fell by 649.5 million barrels to 465 million barrels, by 1.5 percent, while the previous value fell by 5.11 million barrels. marque Systematic investment plans really are a systematic and disciplined procedure for investment and goal setting. Instead of creating a large investment at one time, in SIP you are able to invest small sums at regular intervals thus making a habit of regular savings. If you are a big spender in order to find your expenditures are more than your income then go for SIP mutual funds. This will force you to spend no less than some section of your revenue monthly. Mutual funds can be a very safe means of investing money and SIP mutual money is better yet. These are perfect ways of the majority of us who can't afford to produce a large investment at one go. This is a good way to save for the child's education, marriage or comfortable retirement in your case and your spouse. The lowest launch investment amount is 500 rupees each month which can be affordable by most people.