It would require: - Two more national wonders, one with banks and other with stock exchanges. It could be: National Bank, gives gold equal 1% of your treasure; and Wall Street, 5%. - The World Bank wonder, +10 golds and triggers the Commercial Victory. Electronics (or Computers) tech needed. - With WB constructed, all the civilizations can make deposits on it. If you stay 10 turns with the greatest deposit, you win. - One of the effects of the Commercial social policies could be changed in order of helps that kind of victory, giving you money for cashed gold.