Group 1 - The core limitation of stock index futures trading is primarily reflected in leverage risk and margin system, which is considered a double-edged sword [4] - Margin trading typically requires a margin ratio of 10%-20%, allowing investors to leverage small amounts for larger positions, but losses can also be magnified by leverage [4] - Forced liquidation risk arises when account equity falls below the maintenance margin level, leading to potential total loss of principal [4] Group 2 - Position limits and large trader reporting systems are implemented to prevent market manipulation, with specific limits set on the number of contracts held by a single account [4] - Institutional investors may face challenges in building large positions due to these limits, necessitating account diversification or quota applications [4] Group 3 - Regulatory policy interventions can be used by authorities to mitigate systemic risks, adjusting margin ratios, fees, and price limits to curb excessive speculation [7] - Transaction costs can significantly increase during market turmoil, as seen in 2015 when margin requirements were raised from 10% to 40% [8] Group 4 - Daily price fluctuation limits restrict the price movement of futures contracts to a certain percentage of the previous day's settlement price, which can disrupt liquidity [10] - In extreme market conditions, consecutive price limits may trap investors in unfavorable positions [11] Group 5 - Liquidity risks are present in non-main contracts and extreme market conditions, where main contracts have sufficient liquidity but far-term contracts may not [12] - Large orders may incur significant slippage costs due to wide bid-ask spreads, complicating exit strategies [13] Group 6 - Trading time limitations exist as domestic stock index futures trading hours are typically shorter than global markets, leading to overnight risks [15] - Investors relying on global strategies may face challenges due to time mismatches in trading hours [16]