The same Wall Street firms that have been the major market makers in bonds have also been the ________ of electronic trading in bonds.

Name: The same Wall Street firms that have been the major market makers in bonds have also been the ________ of electronic trading in bonds.
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Question

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The sentence indicates that the Wall Street firms have been involved in both market making and electronic trading in bonds. The word "supporters" suggests that they have played a positive role in electronic trading in bonds.

The Same Wall Street Firms That Have Been the Major