In the only testimony scheduled this week in the credit card antitrust trial, a law professor appearing as an expert witness for Visa said a Justice Department proposal would be highly disruptive to the industry.

The Justice Department submitted its final proposed remedy to Judge Barbara S. Jones late Friday. The proposal, which was the center of attention during questioning of Prof. Ronald Gilson, calls for banks that sit on the Visa or MasterCard board to issue new cards only under the respective brand. Banks not on an association's board would be free to issue any card brand they choose, including American Express and Discover.

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