Top executives of two companies that typify the financial industry's current rush to bigness suggested Thursday that the merger and conglomeration process may only now be shifting into high gear.

Speaking at conferences in separate cities but sounding common themes about the need for quick and bold action, Kenneth D. Lewis of NationsBank Corp. and Philip J. Purcell of Morgan Stanley, Dean Witter, Discover & Co. said their industries are far from finished.

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