Assessing the price evolution of houses on the basis of average sales prices, as is current practice in Belgium, might be misleading due to changing characteristics of the houses sold in the periods observed. A hedonic index which takes into account changes in characteristics is more appropriate. We use the budget surveys of the Belgian Statistical Institute to illustrate how this also applies for Belgium. The estimated hedonic price index for house sales on the secondary market is practically always below the index based on average sales values for the period considered. This demonstrates the need to collect more extensive data on the characteristics of the dwellings sold in Belgium.Indexes; Sales;
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