Alcoa has offered to sell its stake in Aluminum Corp. of China for $2.1 billion at a price, which is 15 percent below the previous day’s closing price. Alcoa intends to book a $1 billion profit and the sale indicates the company’s concern over the commodities cycle. The price of Aluminum fell 13 percent in the last two months due to an increase in global inventories; further, demand for metals may be affected due to the fear of defaults in the sub-prime mortgage