Cloud computing has attracted a lot of interest from both industry and academia. Many business models have been proposed to bring together cloud consumers and providers. In this paper, a resource trading framework is proposed as an alternative business model for clouds. The under-utilized cloud resources are being solved to potential customers by the guidance of a broker. The applicability of the proposed theoretic model is shown on a simple but demonstrative example. This research may be considered as a preliminary business model, which will further be expanded by integrating more cloudlets that compete with each other.