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3.5.2 Conclusions about how demographic trends <br />may affect housing choice <br />Identifying future housing need based on expected demographic changes <br />requires making qualitative assessments of the future housing market. <br />Demographic changes are likely to affect housing in Eugene's housing <br />market in the following ways over the next 20 years: <br />On average, future housing will look a lot like past housing. This <br />assumption underlies any trend forecast, and allows some <br />quantification of the composition of demand for new housing. As <br />an approximation, the next five years, and maybe the first 10 years, <br />of residential growth will look a lot like the last decade. <br />If the future differs from the past, it is likely to move in the <br />direction (on average) of smaller units and more diverse housing <br />types. Most of the evidence suggests that the bulk of the change <br />will be in the direction of smaller average house and lot sizes for <br />single-family housing. An aging population, increasing housing <br />costs, and other variables are factors that support the conclusion <br />that the future housing supply will include smaller and less <br />expensive units and a broader array of housing choices. <br />No amount of analysis is likely to make the long -run future any <br />more certain: the purpose of the housing forecasting in this study <br />is to get an approximate idea about the long run so policy choices <br />can be made today. It is accepted among economic forecasters that <br />any economic forecast more than three (or at most five) years out is <br />highly speculative. At one year, the forecast is protected from being <br />disastrously wrong by the sheer inertia of the economic machine. <br />But a variety of factors or events could cause long -run growth <br />forecasts to be substantially different. <br />Page 102 ECONorthwest Eugene Housing Needs Analysis <br />