In the UK you can get free off-peak bus travel if you are aged 60+ So here’s a thought.

If the vibrancy and creativity of a city partly depends on the number of young people living and working in and around it, why not do something similar for the 18- 25s? Free off-peak travel on all buses, tubes and trains and subsidized flats for anyone working or studying in what society decides is a ‘useful’ profession (i.e. people working or training to be in the police, hospitals, firefighting, schools and libraries, but also musicians, poets, painters etc).