2. The huge borrowings by the currency traders enable them to manipulate the market; pushing the value of the currency up or down. When the value of the currency changes the traders make a profit. Since the currency traders control trillions of dollars, their profits would be huge, and so would the dividends paid to the investors.
3. The trade in currency is estimated to be 20 times bigger than total world trade. The earnings per dollar invested would be higher than the dividends from production and trading in goods and provision of services. The investors and traders would therefore earn far more than what they would expect if they were to invest only the money they really have.