本研究主要探討，若在過往不曾合作過的公司與財務顧問於一次的收購案當中，一方扮演主併公司、另一方扮演目標公司之財務顧問，則在這次收購案後，有哪些因素可能影響合併後的公司考量是否聘用該次收購案當中的目標公司財務顧問。本研究假設目標公司之財務顧問在面對該目標公司於市場上最後一次的交易，可能面對終期問題(Last period problem)而在顧問費用(Advisory fee)與收購溢酬(Target premium)上做出傷害目標公司利益之行為。實證結果顯示，終期問題的決策在本研究議題上並非主要的結果。我們無法找到強烈的證據顯示在該次併購案中，目標公司之財務顧問若收取較高額的顧問費用，則未來受到合併公司繼續聘用的比率較低。而且於收購溢酬上，則完全沒有發現其與未來合併公司與當次收購案中的目標公司財務顧問有顯著關係的證據。另一方面，本研究發現若主併公司以現金支付收購案的比例越低，未來合併公司與目標公司財務顧問合作的可能性越高。原因可能是目標公司過去的管理階層在持有股票數量越高的狀況下，其對合併公司管理階層決策的影響能力也隨之上升。而且過往與目標公司合作過的財務顧問也相較之下比較了解目標公司的狀況，會使得原本的管理階層有意願再度顧用該顧問以進行後續的合作。

In this study, we focus on the relationship between target’s financial advisors and the combined firms in a M&A deal. If there was no relationship which means cooperation between target advisor and acquirer, then in what circumstances will the combined firm start cooperating with the target advisor afterward? We assume that when target advisors confront the last trade on target companies, there may be a Last Period Problem and advisors may decide to take some harmful actions which are like charging a higher advisory fee to the target firm and making the target premium lower. Such an action would inversely affect the probability of being hired by the combined firm in the future. On the one hand, the empirical study shows the result that in univariate test, the higher the advisory fee charged by target advisors, the lower the probability to cooperate with combined firms in the future. However, we cannot find solid evidence on the way target premium affects the cooperating opportunity. On the other hand, we find that the higher the proportion of the deal is paid by stock, the higher probability that the combined firm will hire the target advisor in the future. The possible reason is that once the manager from target firms has more stocks from acquirer firm, he/she can be more influential to make some decisions on choosing financial advisors.

Alexandridis, G., Fuller, K. P., Terhaar, L., & Travlos, N. G. (2013). Deal size, acquisition premia and shareholder gains. Journal of Corporate Finance, 20, 1-13.
Bharath, S., Dahiya, S., Saunders, A., & Srinivasan, A. (2007). So what do I get? The bank's view of lending relationships. Journal of Financial Economics,85(2), 368-419.
Brookhart, M. A., Schneeweiss, S., Rothman, K. J., Glynn, R. J., Avorn, J., & Stürmer, T. (2006). Variable selection for propensity score models. American Journal of Epidemiology, 163(12), 1149-1156.
Chang, X., Shekhar, C., Tam, L., & Zhu, A. (2010). „Prior Relationship, Industry Expertise, Information Leakage, and the Choice of M&A Advisor‟. Working paper, Nanyang Technological University, University of Melbourne, and University of Macau.
Dittmar, A., Mahrt-Smith, J., & Servaes, H. (2003). International corporate governance and corporate cash holdings. Journal of Financial and Quantitative Analysis, 38(01), 111-133.
Ellis, K., Michaely, R., & O’Hara, M. (2005). Competition in investment banking: Proactive, reactive or retaliatory. Unpublished working paper, Cornell University.
Francis, B., Hasan, I., & Sun, X. (2014). Does relationship matter? The choice of financial advisors. The Journal of Economics and Business, 73, 22-47.
Ghosh, A., & Ruland, W. (1998). Managerial ownership, the method of payment for acquisitions, and executive job retention. The Journal of Finance, 53(2), 785-798.
Griffith, S. J. (2002). Deal Protection Provisions in the Last Period of Play. Fordham Law Review, 71, 1899.
Hayward, M. L. (2003). Professional influence: The effects of investment banks on clients' acquisition financing and performance. Strategic Management Journal, 24(9), 783-801..
Hayward, M. L., & Hambrick, D. C. (1997). Explaining the premiums paid for large acquisitions: Evidence of CEO hubris. Administrative Science Quarterly, 103-127.
Kengelbach, J. & Roos, A. (2011). Riding the Next Wave in M&A. Report., Boston Consulting Group.
Ljungqvist, A., Marston, F., & Wilhelm, W. J. (2006). Competing for securities underwriting mandates: Banking relationships and analyst recommendations. The Journal of Finance, 61(1), 301-340.
Ljungqvist, A., Marston, F., & Wilhelm, W. J. (2009). Scaling the hierarchy: How and why investment banks compete for syndicate co-management appointments. Review of Financial Studies, 22(10), 3977-4007.
Lott Jr, J. R. (1987). Political cheating. Public Choice, 52(2), 169-186.
Moeller, S. B., Schlingemann, F. P., & Stulz, R. M. (2004). Firm size and the gains from acquisitions. Journal of Financial Economics, 73(2), 201-228.
Netter, J., Stegemoller, M., & Wintoki, M. B. (2011). Implications of data screens on merger and acquisition analysis: A large sample study of mergers and acquisitions from 1992 to 2009. Review of Financial Studies, 24(7), 2316-2357.
Petitt B. and Ferris K. (2013). Valuation for Mergers and Acquisitions (2nd ed.), Pearson Education.
Rosenbaum, P. R., & Rubin, D. B. (1983). The central role of the propensity score in observational studies for causal effects. Biometrika, 70(1), 41-55.
Rosenbaum, P. R., & Rubin, D. B. (1985). Constructing a control group using multivariate matched sampling methods that incorporate the propensity score. The American Statistician, 39(1), 33-38.
Rosenbaum, P. R., & Rubin, D. B. (1985). The bias due to incomplete matching. Biometrics, 103-116.
Saunders, A., & Srinivasan, A. (2001). Investment banking relationships and merger fees. Working Paper, New York University