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Stock is supposed as a thermometer measuring state of the economy. The trends of the socks are easily perceptible through the stock market indices. Much has been said of the speculation, innovative products and formed bubbles after the economic crises. The American stock indices have fallen as a result of the subprime mortgage market's crises, and have risen into unprecedented heights nowadays. We would like to analyze what reasons could be behind the shares rush. Valuation of shares breaks away from fundamentals again, or the indices show the real power of the economy? Perhaps the effect of non-standard economic policy tools creates the waves or the fast cash flow between share markets, possibly effects of other factors? The rising and is visible, now we try go into the details and find an analytical method which is able to indicate a function-like relationship between the components