This week on Taking Stock Susan Hayes Culleton looks at how weight-loss drugs are changing economic patterns all around us when she talks to Ben Spencer who is science editor with The Sunday Times.

Susan talks to Jay Zagorsky of the Questrom School of Business at Boston University about his new book ' The Power of Cash: Why Using Paper Money is good for you'.

Plus, with new stats showing just how much Irish people listen to music online Susan talks to arts journalist and author Aoife Barry about the popularity and numbers behind music streaming.