Who's your boss? Peter Day explores how three different companies, in three different countries, do business without managers. Who hires and fires? And how do you get a pay rise? He asks how these radical organisations emerged, and whether other companies may follow their lead.

Producer: Rosamund Jones

Opera is an expensive art form. It receives millions of pounds of public money. Can that be justified? Peter Day gets a range of operatic experiences - from top opera companies, to pub performers and a country house summer festival. The first opera was performed 400 years ago in Italy; how does the future look?

Producer: Penny Murphy

As the race to develop driverless cars hots up around the world, the UK is determined not to be left in the slow lane. Government money is being invested to help test vehicles and 'pods' over the next three years.

Remarkable start-up stories of entrepreneurs from Saudi Arabia, Israel and New Zealand.

What exactly is economics? Science or art? An explanation of our society based on observable, demonstrable law or is it an attempt to systematise the unknowable: the mysteries of the human mind?

As Dame Ellen MacArthur circumnavigated the globe she got first-hand knowledge of the finite nature of the world’s resources. When she retired from sailing she created a foundation to promote the concept of a 'Circular Economy' - where resources are re-used and waste reduced to zero. Many companies around the world - including some of the biggest, like Unilever - are responding to her ideas.

Peter Day talks to the record-breaking sailor, to Unilever, and to the creators of an innovative urban farm in New Jersey about why these concepts are so important and how businesses can take them on board.

Producer: Sandra Kanthal

Mohed Altrad was born in the Syrian desert, an orphan and in poverty. He does not know how old he is. He is now a French billionaire and he has just been chosen as Ernst and Young World Entrepreneur of the Year. In this week's Global Business he tells Peter Day about his extraordinary story and the international company he's created over the past 30 years.

An International Labour Organization report ranked Colombia second globally for the percentage of women in middle and senior management positions. Peter Day investigates why Colombian women have managed to advance in business and whether the figures are a true reflection of life for women in a country known for its machismo culture.

Over the past decade the Colombian city of Medellin has changed its reputation from murder capital to model of innovation. Peter Day investigates how the city’s transformation led by its public institutions might have lessons for other cities struggling with violence and poverty.

Medellin used to be one of the most dangerous cites on earth; with a reputation for kidnapping and murder, as well as a thriving drugs trade. Now Colombia's second city has become a top global tourist destination. Peter Day reports on a remarkable transformation.