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The UK Prime Minister Boris Johnson has quit as leader of the Conservative party. It follows a series of ministerial resignations and will lead to the end of Mr Johnson's three year reign as the country's leader at a crucial time for the UK economy. We assess the reasons that have led to this point, get reaction from Europe and ask who will be next in Number 10 Downing Street? We look at what the Prime Minister's resignation may mean from a business perspective with Harvard University economics professor and former IMF chief economist, Kenneth Rogoff. Columbia University economist Cary Leahy gives us the lowdown on the US markets. (Image:Prime Minister Boris Johnson addresses the nation as he announces his resignation outside 10 Downing Street, on July 7, 2022 in London, England. Credit: Getty Images)