HARI SREENIVASAN:

The cost of buying or renting a home in key American cities keeps on rising. A new study out finds more than 40 million households are spending a third of their income on rent.

And the housing shortage in cities like New York, Washington and San Francisco may be costing more than 100 million American workers thousands of dollars in lost wages.

Special correspondent Duarte Geraldino explains why as part of our weekly series on Making Sense of financial news.