There are signs that the 40 per cent fall in oil prices might not deliver the expected stimulus. Chris Giles assesses the outlook for the global economy while FT reporters look at the prospects for key exporters and importers.

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The global financial crisis of 2008 had a big impact on migration, with a million fewer people a year moving to another country on average after 2010 than in the 10 years before. But since 1960, the percentage of the global population classified as migrants has remained steady at roughly 3 per cent, largely as a result of population growth. The OECD last year found that if there was a cost from new migrants it was generally small.

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Global consumption of farmed fish and seafood is set to exceed that of wild fish this year, according to the UN’s Food and Agriculture Organisation. With the total traded fish market worth $136bn in 2013, this turning point for the industry ensures a more stable food supply but it also carries environmental risks.

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US prosecutors are offering immunity deals to junior traders in London as they try to gather evidence against banks and more senior staff in the investigation into alleged currency market manipulation. The Forex scandal is, at its core, a story about alleged wrongful sharing of information to boost trading profits. In this interactive, the FT has compiled 30 foreign exchange traders and sales staff who so far have been suspended, placed on leave or fired amid regulatory investigations that started in 2013. Read more

by Gavin Jackson and Keith Fray

On Tuesday the International Monetary Fund released its latest World Economic Outlook. A striking new finding emerges: the seven largest emerging markets are now bigger, in gross domestic product terms, than the long established G7 group of industrialised nations, when measured at purchasing power parity (PPP). Read more

By John Burn-Murdoch and Aleksandra Wisniewska

Scotland voted on Thursday to remain in the United Kingdom, with the pro-union camp securing 55.3 per cent of the vote. Read more