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It's the biggest retail day of the year in many parts of the world. But in the midst of an economic storm, is Black Friday the bellwether of a gloomier holiday season?

For the African e-commerce platform Jumia, Black Friday comes at a particularly turbulent time. The firm's co-founders stepped down after it posted major losses earlier in the year. Jumia's new boss tells us about the latest restructuring effort.

Another company seeking to transform its fortunes is the web platform Yandex, often touted as Russia's answer to Google. We hear why part of that means cutting ties with the country altogether.

(Picture: Buyers scramble for shopping trolleys at a Black Friday event in Indiana, USA. Credit: Getty Images.)