IF CURRENT BUSINESS WISdom is "get big or get out," banks pondering the Dean Witter-Morgan Stanley merger might entertain joining them. The combination creates the nation's biggest full-service brokerage, perfectly capable of giving banks new headaches.

Combining "Main Line" Morgan and Main Street Dean Witter establishes a company with plenty of deals-and product-on one end, and distribution clout on the other. And the Discover card's income stream can only reinforce the company during whatever bear market may come.

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