Suppose first that all immigrants stay and claim pensions, q = 0, but that none bring
children, m = 1 and that immigrants contribute similarly to natives, T N = T M. Then
only the second, necessarily positive, term c(1 + n)
2 is non-zero. Immigrants more than
pay their way since they arrive with education already paid for and the gain per old
person is proportional to the education cost saved.
Suppose first that all immigrants stay and claim pensions, q = 0, but that none bringchildren, m = 1 and that immigrants contribute similarly to natives, T N = T M. Thenonly the second, necessarily positive, term c(1 + n)2 is non-zero. Immigrants more thanpay their way since they arrive with education already paid for and the gain per oldperson is proportional to the education cost saved.
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