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Housing supply is the quantity of available residential housing in any given housing market. The housing market determinants of supply can be dynamic, if not irregular, and highly dependent on diverse and variable economic, regulatory, and natural conditions. Multiple variables operating in the market that actively influence housing supply are far more complex than consumer demand behavior with respect to the ebb and flow of housing units moving in and out of the market. While it is true that supply and demand economic theory is relevant to housing, such economic theory does not fully explain housing supply. A better way to understand housing supply is to view it as an economic outcome and indicator of the elasticity of urban economies. Economic models that follow the trend in the elasticity of housing supply consider the upward and downward movement of the quantity of housing units in the market and whether there is an association between certain independent variables, such as the construction and capital costs, employment, household income, the age and condition of the housing stock, vacancies, and pricing and regulatory intervention, that may impact housing supply and provide explanatory indicators of elasticity or inelasticity. Any combination of these and other independent variables that may be associated with a significant increase in housing supply would be a measure of elasticity, meaning that the probability of an expansion in the supply of housing is good. The full array of variables that impact housing supply illustrates the complexity of housing supply beyond what the term may imply.

Housing Supply Dynamics

Housing is durable, and housing supply relies on the durability of housing to explain its persistence as an economic indicator. Existing housing units that are stable and actively engaged in the market, whether owner occupied or for rent, contribute to housing durability and account for a much greater percentage of the housing supply than do newly constructed units. The durability of the housing supply notwithstanding, temporal trends relating to movements between value appreciation and depreciation, value pricing and rent levels, quality and physical condition degradation, new construction and the loss of units, population and demographic diversity, and natural and regulatory constraints can be either, all or independently, positive or negative adjusters in determining the elasticity of housing supply.

By definition, housing is not a true commodity, however. Unlike gold, copper, and pork bellies, which are always distinguishable as gold, copper, and pork bellies, housing has no distinct identity due to the wide variety of types, structural formats, ownership and investment arrangements, and other features that differentiate the heterogeneity of housing. Housing heterogeneity, as a characteristic of housing supply, parses housing into a proper order of utilitarian arrangements that establish whether housing units are available for use in the market or simply inert structures that have no residential application or investor value. The elasticity of housing supply in urban economies and the manner of the concomitant availability of residential housing units, when combined with increased consumer interest, can have a positive impact on the real estate market, but this outcome does not lead to a corollary resulting in the commodification of housing. Apart from whether the quantifiable supply of housing in the market may be as high or as low as consumer demand, the reality is that the actual quantity of available housing within an urban area must be sufficient to accommodate the diverse needs, interests, and economic capacity of the consumer population of that urban area. This reality, alone, is important in determining the equilibrium of housing supply in the market.

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