CHENGDU, Dec.21 (NBD) -- A share market fluctuates slightly on Tuesday with SSE Composite Index down 0.49% to 3102.88 points and Shenzhen Composite Index down 0.14% to 1981.32 points. The total amount of trades keeps at almost the same level of that of yesterday. Overall stock market performance is not good except for a few sub-new stocks and stocks of security companies. The stocks of state-owned enterprises helped drive stock prices up a little bit near the closing time.

To ease liquidity strain, People's Bank of China injected 45 billion yuan (6.6 billion US dollars) on last Friday and 65 billion yuan (9.3 billion US dollars) on Monday to the market. The figure even goes up to 165 billion yuan (23.74 billion US dollars) on Tuseday. However, effects are limited. Treasury bond futures were down to limits on last Thursday but rebounded wildly on Last Friday. According to Shibor, capital costs are going up in recent days, indicating more liquidity is still in need.

Because of central bank's "moderate intervention", the overall stock market may not experience major fluctuations before the end of this year. However, investors have to be careful about their position sizing. I think the stocks of growth enterprises, especially private ones are worth investing because of small circulations. It's a good choice when you are on a tight budget. Another reason is personally I think more preferential policies will be introduced to private enterprises in the future.