SHANGHAI, Aug 18 Reuters China39;s securities regulator unveiled a package of measures on Friday aimed at reviving a sinking stock market, but investors said they would do little to boost confidence if the economy remains sluggish.

The China Securities Regulatory Commission CSRC proposed steps including cutting trading costs, supporting share buybacks and encouraging longterm investment to support a stock market that has slid to ninemonth lows.

The regulator said it did not know if there would be a cut in stamp duty, a measure which has been discussed recently but which the CSRC said is beyond its power, falling within the remit of the Ministry of Finance.

Other measures laid out by the CSRC include boosting the development of equity funds, studying plans to extend trading hours, and improving the attractiveness of listed companies.

China39;s leaders vowed in late July to reinvigorate the stock market, which has been reeling as the country39;s economic recovery flags and woes in the property market deepen.

The CSRC said on Friday that stablizing the stock market was a priority. Without a relatively stable market environment, there39;s no basis for reviving the market and lifting sentiment, the regulator said.

Some investors said they were disappointed with the plans. Niu Chunbao, a fund manager at Wanji Asset Management, said the policies would not be enough to offset broader concern about the Chinese economy.

The key to lifting market sentiment is to rescue the…