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If you have ever bought something in an online shop or been to a restaurant, chances are you’ve read a review for it, apparently written by a customer. And chances are you’ve also spotted more than a few suspicions ones, which stand out for their unqualified and lavish praise while being unusually free of personal details, or perhaps because they appear as a diatribe of awfulness designed to put you off forever. Who wrote those? In fact, there's a whole industry surrounding fake reviews - and it matters because more and more of us are buying things online and relying on other people's online advice to make the right choice. Freelance journalist Oobah Butler talks to us about his entire fake restaurant in London, James Kay, at review site Tripadvisor, tells us how they try to weed out inventions such as Oobah’s and brand reputation consultant Simon Wadsworth lays on tips for consumers and businesses.(Picture: Customer review rating. Credit: Getty)

Would you invest in North Korea? US President Donald Trump raised the idea at his summit with North Korean leader Kim Jong-Un. His vision of a private condo on a North Korean beach is probably a long way away, but there are plenty of other countries lacking investment. Paul Domjan, global head of research at Exotix, an investment firm and research agency, explains what a frontier market is.Byung-Yeon Kim, professor of economics at Seoul National University, tells us how North Korea’s economy works.(Picture: A woman carries a boxed flat-screen television on her back as she crosses a road in Pyongyang. Credit: Getty Images.)

Colourism is a more insidious form of racism, and harms the prospects of finding work and love for people with darker skin around the world.Natasha Pizzey reports from Mexico and Daniel Gallas reports from Brazil on the efforts to fight back against the prejudice against skin tone, which often emanates from within the same ethnic community as the victims. Meanwhile, Ed Butler speaks to Sunil Bhatia, a professor of human development at Connecticut College in the US, who has studied the rise of this phenomenon around the world.(Picture: Two young black women with contrasting skin tones; Credit: PeopleImages/Getty Images)