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Could you elaborate on the reasons why investors choose to purchase derivatives? I'm particularly interested in understanding the motivations behind this decision. Do derivatives offer unique benefits that investors find attractive? Are they used as a risk management tool or as a means to generate higher returns? I'm also curious about the types of investors who typically invest in derivatives and what their investment objectives might be. Additionally, how do investors evaluate the risks associated with derivatives and ensure that their portfolios are properly diversified? Could you provide some examples or case studies to illustrate these points?