Is there a moral obligation on richer nations to help struggling countries?

From the BBC World Service: The head of the World Trade Organisation Ngozi Okonjo-Iweala tells us richer countries have a moral obligation to help poorer ones through the cost of living crisis. Plus, what next for games developer Activision Blizzard and its $70 billion tie-up with Microsoft after the UK competition regulator said it would hurt consumers? And, can Credit Suisse rebuild? After a string of scandals, it has a new management team and a new plan but a massive annual loss - its worst since the 2008 financial crisis - shows the scale of the task ahead.