The YIMBY movement is a pro-housing movement based on supply-side economic theory that focuses on deregulating housing in order to encourage an expansion of supply. YIMBYs advocate for the increased development of housing, opposing regulations which limit density, and advocate for denser neighborhoods, often supporting the expansion of public transportation. It stands in opposition to NIMBY tendencies, which generally stand opposed to new housing developments at the local level.
Lib Dem conference: Housing pits Nimbys against Yimbys and 'Yifys'
There are Lib Dem divisions about what to do about new homes and where to build them.
BBC News