This study is concerned with the impact of the 1986 Stock Market deregulation, or Big Bang, on the\ud efficiency of the United Kingdom government securities market. The main theoretical finding is that the\ud change to dual capacity dealing with negotiated commissions cannot be justified economically without\ud the inclusion of a best execution rule for broker/dealers.\ud The empirical section of the study has three parts. The first part uses established and new autocorrelation\ud techniques to test market efficiency in the traditional weak-form efficient market hypothesis\ud paradigm. The second part tests market efficiency through an analysis of pricing residuals from fitting\ud term structure curves. A new method to fit these curves is developed. The third section tests market\ud efficiency by examining evidence of anomalies in the shape and movements of the term structure. From\ud all three sources, there is strong evidence that the changes introduced by Big Bang improved efficiency\ud in the gilt-edged market
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