Ql.a. List the main function of investment banks in the financial system. (, Q.lb. Betas of individua l securities are unstable over time. Which factors could causea company's beta to change over...

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Extracted text: Ql.a. List the main function of investment banks in the financial system. (, Q.lb. Betas of individua l securities are unstable over time. Which factors could causea company's beta to change over time: