期货合约的主要要素包括哪些？

Group 1 - The core elements of futures contracts include the underlying assets, which can be categorized into commodities (such as soybeans, corn, copper, aluminum, and crude oil) and financial instruments (such as stock indices, government bonds, and foreign exchange) [1] - The standardization of underlying assets is mandated by regulations, ensuring clarity in quality, specifications, and measurement methods, which helps eliminate trading ambiguities [1] - Contract units and delivery terms are fundamental to the execution of futures contracts, with contract units representing the quantity of the underlying asset per contract, and delivery terms specifying the delivery period and method [1] Group 2 - Price-related factors determine the trading precision and risk boundaries of contracts, including quotation units, minimum price fluctuation, and daily price limits, which help prevent excessive speculation and price volatility [2] - The trading code serves as a unique identifier for contracts, facilitating quick recognition by participants, while trading hours are set by exchanges to ensure orderly trading [2] - The margin system is a core risk control element in futures trading, requiring traders to deposit a margin as a performance guarantee, which reflects the leveraged nature of futures trading and helps mitigate default risks [2]