We investigate whether performance enhancement motivates the changes to the constituents of the Standard and Poor's 500 Index, and whether these changes in fact enhance the Index's performance. To test these, we compare the performance of the stocks that were deleted from the Index to the...

Weights in the Toronto Stock Exchange 300 index are determined by the market values of the included stocks' public floats. In November 1996, the exchange implemented a previously announced revision of its definition of the public float. This revision, which increased the floats and the index...

Weights in the Toronto Stock Exchange 300 index are determined by the market values of the included stocks' public floats. In November 1996, the exchange implemented a previously announced revision of its definition of the public float. This revision, which increased the floats and the index...