The origins of and potential solutions to California’s housing crisis, explained.

Over the past several years, California has not only produced too little housing, but too little of the right kind of housing. Between 2009 and 2014, the state added 77,000 more households than housing units. The housing it has produced is often located far from jobs and transit, or is too expensive for low and sometimes even middle income people to afford.

“It’s a desperate situation right now,” said Dowell Myers, an urban planning professor at University of Southern California. “We really have to rethink everything.”