Why are lab monkeys so expensive?

Seen as pests in some parts of Asia, long-tailed macaques are highly sought after in the world of biopharmaceutical research for drug development. But now a worldwide shortage means one monkey can sell for tens of thousands of dollars - so what’s driving up the cost? Asia Specific host Mariko Oi is joined by the podcast’s editor Bill Birtles, Bloomberg reporter Amber Tong and Liza Tambunan from BBC News.