If the Doha trade talks are not to collapse, both countries must open their farm markets more.
And he has also said that if the Doha trade talks can't be restarted consideration should be given to a bilateral India-EU free-trade agreement.
The Doha trade talks were supposed to be finished by now, culminating in an ambitious agreement to free trade in farm goods and services.
Despite Brazil's best efforts, the Doha trade talks have stalled.
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Ms Merkel may also raise the Doha world trade talks, scuppered by a row this summer over American farm subsidies.
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The European Union and the United States agreed to remove subsidies on agricultural exports and to reduce other farm aid in a deal that rescues the Doha world trade talks .
In the absence of a conclusion to the Doha free trade talks, Mr Cameron also proposed that a "coalition of the willing" could "forge ahead with more ambitious deals of their own" such as agreements with India, Canada and Singapore.
This is the president who attacks the European Central Bank at almost every opportunity for its rigid monetary policy, criticises the European Commission for its promotion of competition and is seeking to undermine the Doha world trade talks because they threaten to cut European Union farm subsidies.
Only that one extra vote permitted the Doha round of trade talks to begin.
That does not mean it is universally accepted: witness the travails of the Doha round of trade talks.
We are working for a successful Doha round of trade talks, and we must complete a good agreement this year.
But there are a few worrying omens in the air, notably the collapse of the Doha round of trade talks.
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As for dampening our ardour for a successful agreement at the upcoming Doha round of trade talks, the new farm law, if anything, provides even greater impetus for our negotiators.
And much more serious than that, because it affects the whole world, is his failure to put anything worthwhile on the table to help revive the moribund Doha round of trade talks.
So it is strange that agriculture should now lie at the heart of two big global projects of the next year or so: the Doha round of trade talks and the eastward expansion of the European Union.
Mr Obama has expressed more support lately for completing free trade agreements with Panama, Colombia and South Korea, the Doha round of world trade talks, and the Trans Pacific Partnership, but that has not translated into results.
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Pascal Lamy, head of the World Trade Organisation, invoked them in his plea this week to save the Doha round of global trade talks.
Vo Tri Thanh, a trade economist in Hanoi, argues that Vietnam could play a positive role in the Doha round of world trade talks as a fairly poor country that nevertheless strongly supports freer trade.
In Britain this week he intends to push for compromise in the Doha round of world trade talks.
In addition, the Doha round of multilateral trade talks is all but dead.
With the Doha Round of multilateral trade talks moribund, this decision could shape the future of the world trading system.
More important, the future of the now-stalled Doha round of multilateral trade talks is essentially dependent on Congress' renewal of fast-track.
Meanwhile, the Doha round of global trade talks remain at a standstill.
Not surprisingly he came out of the starting gate in the role saying that resuscitating the Doha Round of free trade talks is priority number one.
He urged them to press India's case in the Doha round of global trade talks and called on them to carry India's concerns about terrorism to the world stage.
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Frictions will also emanate from trade negotiations India was blamed, along with China, for the collapse of the latest meeting of the Doha round of world trade talks in late July this year.
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Japanese policymakers insist that a breakthrough on agriculture in the Doha round of global trade talks would compel Japanese leaders to confront the farmers (whose average age is over 60) once and for all.
Finance ministers will be also be discussing China's plans to float its currency and will try to stimulate progress in the Doha round of world trade talks, due to resume in Hong Kong in December.
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