The currency conversion rates has made some countries richer at the expense of other because of how the currencies are valued at different times . The Africa continent has always been the victim of this rates because of what the developed countries do such as giving them roams and mining the minerals them selling those minerals back at higher prices which deprive those countries of their currency reservoirs . Some industries such as oil refineries have been died due to external interferences. What do you think about this extortion mechanisms ?