Group 1 - The profitability of shorting alumina futures is determined solely by the "price difference" [1] - The profit and loss formula for shorting is: Profit/Loss (CNY/ton) = Opening Price - Closing Price - Fees [1] - A short position incurs losses only when the closing price exceeds the opening price [1] Group 2 - Factors that can drive alumina prices up, leading to potential losses for short sellers, include: sudden reluctance to sell in the spot market, environmental production limits in the north, and fluctuations in bauxite supply [2] - Other contributing factors include concentrated purchasing by electrolytic aluminum plants and inventory levels dropping below safety thresholds [2] - Insufficient registered warehouse receipts in the delivery month can lead to short squeezes by bulls [2] - Macroeconomic factors such as a weakening dollar and a general rise in commodity prices can create emotional premiums [2] - Setting stop-loss orders can limit and control potential losses, ensuring that there is no absolute scenario where "prices can only rise and not fall" [2]