Reference no: EM131267128
Urban Economics Question: you will solve for the equilibrium population of an idealized city experiencing rural-urban migration, following the augmented Harris-Todaro model. The incomes earned in urban employment and in the rural area are y and yA, respectively, and t is commuting cost per mile. J is the number of available urban jobs.
A) Suppose the city is a rectangle 10 blocks wide with the employment center at one end (it's an island like Manhattan). The city spreads out along the length of the island to accommodate its population, with its edge located x¯ blocks from the employment center. Compute the city's land area in square blocks as a function of x¯ . Assuming that each urban resident consumes 0.001 square blocks of land, compute the amount of land needed to house the city's population L. Set the resulting expression equal to the city's land area, and solve for x¯ in terms of L.
B) With J jobs in the city, the chance of a resident getting one of the jobs is J/L, which makes the expected income of a city resident equal to y(J/L). The expected disposable income net of a commuting cost for a resident living at the city's boundary is then y(J/L) - tx¯ . The rural-urban migration equilibrium is achieved when this disposable income equals the rural income as explained in Chapter 3. Write down this equation, and substitute your solution for x¯ in terms of L from part (a). Then multiply through by L to get a quadratic equation that determines L.
C) Suppose that y = 10,000, yA = 2000, t = 100, and J = 30,000. Substitute these values into your equation from part (b), and use the quadratic formula to solve for L (it's the positive root). The answer gives the city's equilibrium population.
D) In equilibrium, what is the chance of getting an urban job? What is the implied unemployment rate in the city?
E) What is the distance to the edge of the city? How much does a resident living at the edge spend on commuting?
F) Suppose that y rises to 12,000. Repeat the calculations in parts (c), (d), and (e). Given an intuitive explanation of the changes in your answers to (c) and (d)
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Urban economics question
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