1. Forex trading is operating all over the world by 24/7 so it is influence by the global economic changes like change in inflation of major trading countries or change in economy.
2. Forex market also affect when major events take place in any corner of the world. Suppose in change in government, terrorist attack, and natural calamities like cyclone, earthquake and windstorm.
3. It also affect when change in government policy or any declaration by the major trading countries like US, Japan, Australia, UK etc.
4. Foreign investors (Under FDI policy) and the government funds are the major stack holders so any withdrawal or investment in the forex market will influence the forex market.
5. Finance market changes like change in interest rates can also affect the forex market.
The currency trading calculated on the basis of cash to get the coverage as per your needs.
