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Rectangular Land Market Model

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Peter Tomlinson

Introductory Notes on Rectangular Land Market Model May, 2010 These notes elaborate on a land-market model presented in OSullivans textbook Urban Economics. Building on the textbooks analysis, our focus will be on these key questions: N What is the impact on land rents if an endoge1ous output price replaces the textbooks exogenous output price? N What is the impact on land rents and output price if the land supply is expanded or contracted? The rectangular model is introduced in the sectthn Bid-Rent Curves for tth Manufacturing Sector (pages 122-124, 7 edition, or 102-104, 6 edition). In that sections Figure 6-1, we see an equilibrium bid rent curve (= bid rent function, abbreviated here as BRF). The BRF shows zero-economic-profit land rents for manufacturing firms as a function of distance (x) from a highway. The zero-economic-profit condition is met when firms earn only the profit required to stay in business. The textbook discussion continues in A General Equilibrium Model of a Monocentric City (pages 192-194, 7 edition, or 157-160, 6 edition). In Figure 7A-3 we again see an equilibrium BRF for manufacturing firms now labelled R b. (the b being for businesses that manufacture a product). Figure 7A-3 includes residential land as well as manufacturing and agricultural land, but the discussion in these introductory notes will be limited to manufacturing and agriculture. Thus Figure 7A-3s bid rent functions labelled R r (initialr (streetcar)be disregarded for now. They are considered, along with the upper-right (labour market) diagram, in separate notes entitled The General Equilibrium Rectangular City Model. 2 In the lower part of Figure 7A-3 we see the manufacturing land area (marked D), with its western boundary formed by a highway 3 1An endogenous is determined in the model; an exogenous price is given from outside the model. 2A land market could function without residential land if firms provide their employees with living accommodation at the job site. 3 As illustrated in Figure 7A-3, this western boundary is labelled the centre, but we will assume here it is a north-south highway as in Figure 6-1. The lower part of Figure 7A-3 shows a land- market map (the land market as viewed from above). As has been noted, the area marked D (demand for labour) is land occupied by manufacturing firms firms that generate demand for labour. The area S (supply of labour) is land occupied by housing firms (firms housing residents www.notesolution.comSome manufacturing firms are located directly on the highway, and so have zero freight cost to access the highway. Others ship their product to the highway from interior locations, along local roads. Freight cost is defined here as the cost to reach the highway along local roads. These roads run east and west, so distance from the highway (x) is measured to the east. The model includes a variable called non-land production cost (NLPC), which is the same for all firms regardless of location Included in this variable is the cost of freight incurred after a firms vehicles have accessed the highway an equal amount for all firms whether located at x = 0 or an interior location. The rectangular land market has northern and southern boundaries, shown as lines perpendicular to the highway. In the textbooks Fig. 7A-3 they are assumed to be 1 mile apart. However, in these notes we will let the rectangular land markets north-south dimension be an exogenous variable y (in kilometres). We will assume that northern and southern boundaries are imposed on the market by zoning regulations. Zoning regulations specify which land uses are legal at various locations. We will assume that manufacturing is legal only between the northern and southern boundaries, and only east of the highway. Thus manufacturing land is limited to the rectangular area bounded by the highway along its western edge, and bounded by zoning lines along its the northern and southern edges. 4 Agriculture is legal not only in the rectangular area but everywhere else in the model as well. Agriculture is assumed to be the only legal land use outside northern and southern zoning boundaries, and the only legal land use on the other side of the highway. With the upper left part of Figure 7A-3 modified to delete residential bid rent functions, we are left with just two bid rent functions: manufacturing BRF (R ) b and agricultural BRF (R ).aR , tae zero-economic-profit BRF for farms, is horizontal reflecting an assumption that farm costs do not vary with location. who supply labour); this residential land area is ignored in these introductory notes, so manufacturing land will abut agricultural land. Agricultural land is marked A in Figure 7A-3. In the textbook, distance x from the western boundary is in miles. Miles are replaced with kilometres in these notes to simplify calculations combining area and linear measurement. 4 Using zoning boundaries to confine manufacturing land to a permitted zone allows the land supply at each x to be expanded or contracted: the local town or city council can widen or narrow the zone by amending its zoning law, making y a policy variable. The impact of changes to y will be considered later in these notes. The manufacturing land supplys eastern boundary is not specified by zoning but is determined in the land market. The eastern boundary of manufacturing land is where manufacturing firms freight cost has increased to the point they can no longer outbid farms for land, 2
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