
The illustration above shows a simplified variant of the US economy. The commodities market is the cornerstone to any financial market's success. Its role in the economic spectrum is to establish the value of raw products. The GDP is the market value of all manufactured products and commercial services. The quotient between the GDP and the commodity market index ($CRB) is the return-on-investment (ROI), which is a metric used to determine the profitability of the investment (product). The producer price index is a metric used to determine supply, and the consumer price index is a metric used to determine demand. The stock markets' role in the US economy is that of a manufacturer and distributor. Depending on the demand of a product or service, it will purchase up raw goods (commodities), convert them to finished goods or commercial services, and finally distribute them to the consumers (at profit).
Whenever profit is made, it is always taxed by the federal government and the remaining sum goes back to the corporate coffers that make up the stock market. The government's duty is to supervise, regulate, enforce taxes, and at rare occasions, offer relief to failing businesses.