For example, you might think the Euro (EUR) is going to increase in value against the Australian dollar (AUD) so you could place a trade to buy the EUR/AUD currency pair. If the Euro rises you would make a profit; if it drops you would incur a loss. Conversely, if you thought the Euro was going to decrease in value you could place a trade that would benefit from that price movement.
The carry trade opportunity was also seen in USD/JPY in 2005. Between January and December of that year, the currency rallied from 102 to a high of 121.40 before ending at 117.80. This is equal to an appreciation from low to high of 19%, which was far more attractive than the 2.9% return in the S&P 500 during that same year. In addition, at the time, the interest rate spread between the U.S. dollar and the Japanese yen averaged around 3.25%. Unleveraged, this means that a trader could have earned as much as 22.25% over the course of the year. Introduce 10:1 leverage, and that could be as much as 220% gain.
Between 2003 and the end of 2004, the AUD/USD currency pair offered a positive yield spread of 2.5%. Although this may seem very small, the return would become 25% with the use of 10:1 leverage. During that same time, the Australian dollar also rallied from 56 cents to close at 80 cents against the U.S. dollar, which represented a 42% appreciation in the currency pair. This means that if you were in this trade – and many hedge funds at the time were – you would have not only earned the positive yield, but you would have also seen tremendous capital gains in your underlying investment. 
A single pound on Monday could get you 1.19 euros. On Tuesday, 1.20 euros. This tiny change may not seem like a big deal. But think of it on a bigger scale. A large international company may need to pay overseas employees. Imagine what that could do to the bottom line if, like in the example above, simply exchanging one currency for another costs you more depending on when you do it? These few pennies add up quickly. In both cases, you—as a traveler or a business owner—may want to hold your money until the forex exchange rate is more favorable.
It should be remembered that leverage does not alter the profit potential of a trade; but instead, reduces the amount of equity that you use. Leveraged trading is also considered a double-edged sword, since accounts with higher leverage get affected by large price swings, increasing the chances of triggering a stop-loss. Therefore, it is essential to exercise risk management when it comes to leveraged instruments.
400:1: Four-hundred-to-one leverage means that for every $1 you have in your account, you can place a trade worth $400. Some brokers offer 400:1 on mini lot accounts but beware any broker who offers this type of leverage for a small account. Anyone making a $300 deposit into a forex account and trying to trade with 400:1 leverage could be wiped out in a matter of minutes.
Forex, also known as foreign exchange, FX or currency trading, is a decentralized global market where all the world's currencies trade. The forex market is the largest, most liquid market in the world with an average daily trading volume exceeding $5 trillion. All the world's combined stock markets don't even come close to this. But what does that mean to you? Take a closer look at forex trading and you may find some exciting trading opportunities unavailable with other investments.

Margin and leverage are among the most important concepts to understand when trading forex. These essential tools allow forex traders to control trading positions that are substantially greater in size than would be the case without the use of these tools. At the most fundamental level, margin is the amount of money in a trader's account that is required as a deposit in order to open and maintain a leveraged trading position.

When you trade in the foreign exchange spot market (where trading happens immediately or on the spot), you are actually buying and selling two underlying currencies. All currencies are quoted in pairs, because each currency is valued in relation to another. For example, if the EUR/USD pair is quoted as 1.2200 that means it takes $1.22 to purchase one euro. 
With Equivolume, you can plot price and volume activity on a single graph, instead of having volume added as an indicator on the side. This tool draws the bars following their traded volume at a precise point in time (the wider the bar, the bigger the volume). That creates a clear visualization of the volume increase or decrease of an asset’s diagram. A very handy feature for those strategies whose key factor is volume. How to change your table into Equivolume