In addition they prevent excess credit from building up within the Irish financial system which can fuel house-price spirals. There are a myriad of other policies that can help determine whether, at any given price, affordable homes can be built. For example, Project Ireland 2040 outlines a number of policies that will affect future housing supply.
Due to the complex nature of the housing market, the number of different actors and their interactions, policies can affect the market in complex ways. Take for example, infrastructure investment. In the long term, this infrastructure will provide support for more housing.