that contributes to the research will be reviewed. First, the value creation of the mergers and acquisitions will be discussed. After explaining the overconfidence concept from the psychology view, the hubris theory and the overconfidence in the content of corporate finance will be discussed. In the end of this section, the measures of the overconfidence and the hypotheses derived based on the literature views will be proposed. 2.1. M&A and Value Creation Mergers and acquisitions transaction are