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2. The function of capital accumulation and resource allocation in the stock market.According to the research report of financial institutions, the trading volume of derivative financial commodity market usually drops sharply during the period of stock market downturn. This is because investors' income expectations of derivative financial products have decreased, while risk aversion has increased. For example, during the global financial crisis in 2008, the stock market plummeted, and the markets of derivatives such as futures and options also fell into chaos. Many investors suffered heavy losses because of the transactions of derivatives.According to the research report of financial institutions, the trading volume of derivative financial commodity market usually drops sharply during the period of stock market downturn. This is because investors' income expectations of derivative financial products have decreased, while risk aversion has increased. For example, during the global financial crisis in 2008, the stock market plummeted, and the markets of derivatives such as futures and options also fell into chaos. Many investors suffered heavy losses because of the transactions of derivatives.

2. The function of capital accumulation and resource allocation in the stock market.Second, the dependence of derivative financial products on the stock market1. The nature and risks of derivative financial products

Summary: The stock capital market occupies a fundamental position in the financial system. It is not only a barometer of macro-economy, but also has important functions of capital aggregation and resource allocation. Other derivative financial products exist and develop on the basis of the stock market. When the stocks in the stock capital market do not rise, derivative financial products are like rootless trees, lacking the basis of value change, the trading volume decreases, the risk is amplified, and the meaning of existence is almost lost, which is equivalent to zero. This also reminds us that while paying attention to derivative financial products, we can't ignore the cornerstone and root of the stock capital market.1. The economic barometer function of the stock market icon2. The relationship between the market base of derivative financial products and the stock market.