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Cloud Computing is a new paradigm of computing infrastructure provision which promises to achieve a vision of computer utilities. The most active research topic in Cloud Computing is its economic aspect. In this article we give overview of existing literature on Cloud Computing economics (pricing of Cloud services, costs, benefits and risk of Clouds, ROI and cost/benefits models) and propose some new research challenges. Some of the most interesting future topics are a complete cost-benefit analysis methodology development, using simulations to identify tangible cost reduction, sustainability of current prices of Cloud services and system administration cost in a Cloud environment.