The fundamental problem is that Capitalism is incapable of providing Affordable Housing for people with incomes near or below the Poverty Line in a given market.  The better the area is for finding employment that will pay a higher salary, the more Rentiers will charge for living in that neighborhood.  The wealth generated in the neighborhood by commerce gets extracted by those who own or build & sell the housing.  The highest profit margin comes from building houses for the highest earrners and as geographical space gets scarce through growth of the population, the low income population is squeezed out of the market.

The problem has been growing incrementally since the 1980s and reached a crisis ppoint in the last decade.  The only solution now is a massive public works program to build new housing with prices tied to the income level of poverty level people, but this has been perpetually opposed by the industry as too Socialist.  The question now is if there is sufficient popular support to overcome the Rentier political power.  Then comes the problem of how to finance it and where to build it.

Obviously, this isn't just a problem in Spain, it's systemic through all the industrialized countries.  Depending on how much success they have there, it should spread to other countries.  It has the potential at least to recharge a genuine Workers movement on an international basis.

RE