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is one of an
's major clients. "Key" may reflect the size of the client's advertising budget, its profitability, percentage of total agency billings, or some other factor such as the prestige it gives to the agency that represents it.
In sales, a
is a large account—usually generating more than a prespecified annual sales level—that receives special treatment from salespeople.
Dictionary of Marketing Communications.
Sage Publications (2004).
American Marketing Association.
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