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(20 16 real question) The symbol of the futures market in the modern sense is ().
Answer: a, b, c

After decades of development and reform, the Chicago Board of Trade has formed a modern futures trading market model. 185 1, Chicago Board of Trade launches forward contracts; 1865, the Chicago Board of Trade introduced standardized contracts and implemented a margin system. 1882, which allows the exchange to exempt the performance liability through hedging; 1883, the clearing association was established. The implementation of standardized contracts, margin system, hedging mechanism and unified settlement, these historic institutional innovations, mark the establishment of modern futures market.