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4. (10 marks) a. Suppose a worker currently resides in Halifax and is deciding whether to remain there or to move to Toronto. There are three work periods left in the life-cycle. If the worker remains in Halifax, he will earn $20,000 per year in each of the three periods. If the worker moves to Toronto, he will earn $23,000 in each period. The worker's rate of discount is 10 percent. What is the highest level of migration cost the worker is willing to incur and still make the move? b. How does the wage sensitivity of employers determine the economic growth effect of immigration in a country? Explain