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The BRICS group of developing economies – Brazil, Russia, India, China, and South Africa meet in Johannesburg this week for their annual summit.

Top of the agenda will be its expansion. Twenty-three countries have formally expressed an interest in joining the group, while officials have said a total of 40 are seeking membership. We find out why this economic group is so important.

(Picture: Office flags of the BRICS countries on a light background. Summit of Brazil, Russia, India, China and South Africa. Picture credit: Getty Images)