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People facing alarming birthdays often say things like: “Forty is just a number.” You could say the same about “$100 oil”. But such benchmarks concentrate minds. As the oil price threatens to break through $100, politicians all over the world will think hard about the strategic consequences.
So what is likely to happen? The biggest single effect is obvious. Oil producers become richer and more powerful. The biggest oil consumers – the US, China and the European Union – become increasingly anxious. Beneath that big trend, there are smaller effects that could change the course of some of the most delicate and dangerous problems – Iraq, Iran, China’s foreign policy and the resurgence of Russia.
The effects of a rising oil price on the economies of the producing countries are dramatic. The Organisation of the Petroleum Exporting Countries made $650bn from oil sales in 2006, compared with $110bn in 1998. Russian oil and gas revenues have quadrupled over the same period.
When bad governments make good money, they become more relaxed at home and more assertive abroad.
The remainder of this column can be read here. Comments can be made below.
This blog covers a variety of topics from US foreign policy to European politics and the Middle East - and whatever else happens to be in the news or catch my attention. I joined the FT as chief foreign affairs commentator in 2006, after a 15-year career at The Economist which included stints as a correspondent in Brussels, Bangkok and Washington. I write a weekly column on foreign affairs, which appears in the paper on Tuesdays. Occasionally my FT colleagues contribute posts to this blog.
Geoff Dyer is the FT's China bureau chief. He has been a correspondent in Shanghai and in Brazil and has also covered the pharmaceuticals and biotechnology industries from London.
Roula Khalaf is the FT's Middle East editor. She has worked for the FT since 1995, first as North Africa correspondent, then Middle East correspondent and most recently as Middle East editor. Before joining the FT, she was a staff writer for Forbes magazine in New York. 
James Blitz is the FT's defence and diplomatic editor. He has been the FT's political editor, based in London, and Rome bureau chief. James is a former Moscow bureau chief for the Sunday Times.
Alan Beattie is the FT's world trade editor. He has previously been economics leader writer and spent two years in Washington DC as chief US economics correspondent. Before joining the FT, Alan was an economist at the Bank of England. 
Victor Mallet is the FT's Madrid correspondent. He is a former Asia editor of the FT, and, in more than 20 years at the organisation, has also worked in Africa, Europe and the Middle East. In 1990 he escaped from Kuwait after being one of the few foreign correspondents there when Iraq invaded. 
Stefan Wagstyl is the FT's eastern Europe editor, co-ordinating coverage of the region. He has also been the FT's bureau chief in Tokyo and New Delhi.