Bachelor Thesis from the year 2015 in the subject Economics - Finance, grade: 1,7, University of Frankfurt (Main), language: English, abstract: The main issue of this working paper is whether the accounting treatment of the Repurchase agreement 105 contributed to the collapse of Lehman Brothers. It was questioned how the Repos were used and the following effects over Lehman's financial stability. While seeking for an appropriate solution of the main issue, the paper goes through the historical fluctuations of the financial system, from the 1950s till 2006 (two years before the Lehman's bankruptcy). Further, the paper reviews some causes that may have led to the collapse of the investment bank. Finally, the global impact of the collapse has been summarized and possible preventions from future crisis have been proposed by the author.