A pharmaceutical company makes sales calls to phy-sicians to market their drugs. They want to determine the impact of sales calls on the profit it achieves per physician. The profit per physician depends on the number of new prescriptions that are written and the cost of making the sales calls. The cost of making the sales calls depends on the number of sales calls made. The number of sales calls also impacts the number of new prescriptions written. Construct an influence diagram that relates these variable.

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