UCLA Luskin’s Michael Lens spoke to KCBS News’ “Ask the Expert” program about repercussions from the plummeting birth rate in the United States.

The trend is caused by several factors. Many women are more financially independent than in past generations and may choose to delay childbearing. Others, however, are deterred from starting a family due to the high cost of living.

“It’s a much more financially daunting landscape for today’s 18- to 30-year-olds starting out in the world than it was 30 years ago,” said Lens, a professor of urban planning and public policy. “It’s a really damaging thing if young people who want to have children feel financially unable to make that work.”

Advanced economies in the modern era often see declining birth rates, and the consequences include fewer people of working age who are able to hold up the social safety net for those who are retired, Lens said.