政策预期升温，股指震荡反弹

1. Report Industry Investment Rating - No relevant content provided 2. Core Viewpoints - Today, all stock indices fluctuated and rebounded. The total trading volume of the Shanghai, Shenzhen, and Beijing stock markets throughout the day was 2402.9 billion yuan, showing an increase of 35.9 billion yuan compared to the previous day [3]. - The Ministry of Commerce and eight other departments recently issued the "Several Policy Measures for Expanding Service Consumption," proposing 19 specific measures in five aspects to boost consumption demand. Promoting the development of service consumption can create new service - related jobs and stimulate household consumption, thus promoting a positive economic cycle on both the supply and demand sides [3]. - In August, credit and inflation data were weak, and the consumption growth rate slowed down, indicating weak demand from the real - sector. There is a strong expectation for the introduction of policies to stabilize demand in the future, with the key window period for policy introduction expected to be in October [3]. - In July and August, non - bank deposits increased significantly, and the margin trading balance remained at a high level, indicating that the stock market has continuously attracted incremental capital inflows. However, due to the significant increase in the valuations of some stocks previously, there is still a willingness among profit - taking funds to lock in profits, which also leads to short - term technical adjustment pressure on the stock indices. In the future, attention should be paid to the game between the profit - taking rhythm of funds and the fermentation of policy expectations [3]. - In general, the stock indices are expected to experience wide - range fluctuations in the short term [3]. - Currently, the implied volatility of options is within the normal range. Considering the long - and medium - term upward trend of the stock indices, investors can continue to hold bull spreads or ratio spreads [3]. 3. Summary by Related Catalogs 3.1 Option Indicators - On September 17, 2025, the 50ETF rose 0.19% to close at 3.088; the 300ETF (Shanghai Stock Exchange) rose 0.71% to close at 4.653; the 300ETF (Shenzhen Stock Exchange) rose 0.73% to close at 4.800; the CSI 300 Index rose 0.61% to close at 4551.02; the CSI 1000 Index rose 0.95% to close at 7554.81; the 500ETF (Shanghai Stock Exchange) rose 1.03% to close at 7.357; the 500ETF (Shenzhen Stock Exchange) rose 1.27% to close at 2.944; the ChiNext ETF rose 1.96% to close at 3.119; the Shenzhen 100ETF rose 1.36% to close at 3.497; the SSE 50 Index rose 0.17% to close at 2952.78; the STAR 50ETF rose 0.98% to close at 1.44; and the E Fund STAR 50ETF rose 0.86% to close at 1.41 [5]. - For option volume PCR and position PCR, specific values for different options on September 17, 2025, and the previous trading day are provided, such as the 50ETF option volume PCR being 87.34 (previous day: 98.00) and position PCR being 79.25 (previous day: 78.16) [6]. - For the implied volatility of at - the - money options and the 30 - day historical volatility of the underlying assets, specific values for different options are provided, such as the 50ETF option's 2025 September at - the - money option implied volatility being 18.05% and the 30 - day historical volatility of the underlying asset being 15.12% [7]. 3.2 Related Charts - The report provides various charts for different options, including the price trends, volatility, volume PCR, position PCR, implied volatility curves, and at - the - money implied volatility of different terms for options such as the 50ETF option, 300ETF option (Shanghai and Shenzhen Stock Exchanges), CSI 1000 index option, 500ETF option (Shanghai and Shenzhen Stock Exchanges), ChiNext ETF option, Shenzhen 100ETF option, SSE 50 index option, STAR 50ETF option, and E Fund STAR 50ETF option [9][21][34]