2. Yes, but foreign exchange is more complicated than futures, but fortunately foreign exchange is fair and cannot be manipulated by ordinary people. Futures are easily manipulated by predators!
3. Well, it is difficult to see the volume of foreign exchange as clearly as stocks, because there are lists of market entry and exit in every corner of the world, and there are many over-the-counter transactions, so it is difficult for an institution to make accurate statistics. Besides, it doesn't mean much!
4. There is basically no leverage