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Basically, if a manager only focus on the existing customers, there would be a possibility that the profit of a company would going to be in a cruicial since it's just like you're waiting for customer to come in. I mean, why would need a staff if you're just going to wait for customer to come in? what the sense of having a business?
A sales manager should have to focus not only on the existing but for the future customers or for the possible prospects for the company to gain or to grow.