Land policy interventions are important ways for municipalities to implement their spatial development objectives. Such interventions may, however, generate both intended and unintended effects to housing supply and its responsiveness. It is therefore essential to better understand how and through what kind of mechanisms local land policy interventions can influence the quantity of housing supply. This paper addresses these questions. First, we develop a conceptual classification of so-called intervention mechanisms that describes the linkages between local land policy interventions and the quantity and responsiveness of housing supply. The intervention mechanisms build on a review of the urban economics literature and are further developed empirically using extensive expert interview data on local land policy interventions and practices in 30 Finnish municipalities. Based on the understanding that such intervention primarily influences housing supply through either direct or indirect costs on development, we conceptualize seven intervention mechanisms in the Finnish land policy context. Second, we demonstrate the variation in the application of land policy interventions that contribute to the (in)responsiveness of housing supply at the municipal level. Our findings highlight significant variation in the application of such interventions, potentially leading to different outcomes in housing supply restrictiveness. The findings contribute to a deeper understanding of the mechanisms by which land policy interventions operate to affect the (in)responsiveness of housing supply.

中文翻译：

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增进对当地土地政策干预措施与住房供应响应能力之间联系的理解：芬兰背景下的干预机制

土地政策干预是市政当局实现空间发展目标的重要途径。然而，此类干预措施可能会对住房供应及其响应能力产生有意和无意的影响。因此，有必要更好地了解地方土地政策干预如何以及通过何种机制影响住房供应数量。本文解决了这些问题。首先，我们对所谓的干预机制进行了概念分类，描述了地方土地政策干预与住房供应的数量和响应能力之间的联系。干预机制建立在对城市经济学文献的回顾的基础上，并利用有关芬兰 30 个城市当地土地政策干预和实践的广泛专家访谈数据，进一步根据经验发展。基于这种干预主要通过直接或间接开发成本影响住房供应的理解，我们在芬兰土地政策背景下概念化了七种干预机制。其次，我们展示了土地政策干预措施应用的变化，这些干预措施导致了市级住房供应的反应（无反应）。我们的研究结果强调了此类干预措施应用的显着差异，可能导致住房供应限制的不同结果。研究结果有助于更深入地了解土地政策干预措施影响住房供应反应（无反应）的机制。