A public health department is considering five alternative programs to encourage parents to have their preschool children vaccinated against a communicable disease. The following table shows the cost and number of vaccinations predicted for each program:

a. Ignoring issues of scale, which program is most cost-effective?
b. Assuming that the public health department wishes to vaccinate at least 5,000 children, which program is most cost-effective?
c. If the health department believes that each vaccination provides social benefits equal to $20, then which program should it adopt?

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Program Cost (S) 20,000 44,000 72,000 112,000 150,000 Number of Vaccinations 2,000 4.000 6.000 8,000 10,000