This paper represents an analytical economic cost model for cloud computing aiming at comprising all kinds of cost of a commercial environment. To extend conventional state-of-the-art models considering only fixed cost, we developed a concise, but comprehensive analytical model which includes also variable cost allowing for the development and evaluation of business strategies for cloud environments. These strategies can be used for both, cloud providers and cloud consumers. The major goal of our model is to comprise all important economic fundamentals and methods. Thus, this new model supports the decision-making process to be applied with business cases and enables cloud consumers and cloud providers to define their own business strategies and to analyze the respective impact on their business. Based on this model also the energy efficiency of cloud systems can be evaluated according to chosen business models.

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