Current scenario of the electricity market requires an analysis of the competing pricing mechanisms of uniform and pay-as-bid pricing. We adopt game and auction theories to analyze the strategic behavior of players in the bilateral markets. With STBA, we aim to develop an approach that is capable of analyzing the strategic behavior in power markets and quantifying it economically. It is an agent-based model proposed to analyze how market participants can learn tacitly collusive behavior. Different levels of market concentration are used for aligning the portfolio of the clients and creating a sale optimization approach considering the transmission constraints and all other factors affecting their success probability.