How the IMF chooses a new leaderEven before Dominique Strauss-Kahn submitted his resignation from his prison cell, speculation about a successor was r

Even before Dominique Strauss-Kahn submitted his resignation from his prison cell, speculation about a successor was rife.

The selection of a new managing director of the International Monetary Fund (IMF) is a job for the agency's executive board.

There are 24 of them and they are representatives of the IMF's 187 member countries.

The big economies have their own seat on the board. That includes the US, China, Japan and the UK. Others are grouped into constituencies, so that one executive director represents a group of countries.

They will try to choose a new managing director by consensus. But if they cannot agree they can make the choice by voting.

The votes they cast are weighted by the country's subscription to the IMF, known as its quota. That in turn is roughly related to the nation's share of the world economy.

But the weights are behind the times.

China and many other emerging economies are underrepresented. Western Europe gets more than its share of the votes.

Here are some examples: China's share of the global economy (using a measure known as purchasing power parity GDP) is 13.6%, but its share of the vote is 3.82%.

The UK and France each account for 2.9% of PPP GDP, but each has 2.9% of the vote.

The discrepancies are less marked if you use the main alternative to PPP, but they don't disappear.

The European Union (EU) has a total share of the vote of about a third. So if they can unify behind a single candidate that is an important start.

Unity, however, is not a foregone conclusion. Is it ever in the EU?

The EU has in the past failed to back the same candidate.

In the 1980s it tried and failed to unite with the result that developing countries had an important role in the choice between two candidates.

Admittedly, both were European, so it was not the kind of influence that emerging economies would like to have today.

If Europe can unite, and if it can persuade the US that the IMF needs another European leader, that would bring the total votes to nearly 50%.

The reason the US might be persuaded is the fact that the IMF's biggest current problem is the euro area - though some might say that's a reason for not having a European in charge.

Leaders of the G20 major developed and emerging economies have repeatedly said in summit communiques that the leadership of all the international financial institutions should be chosen in a way that is open, transparent and based on merit.

That looks like an end to the post-war carve up in which a European has always had the top job at the IMF while the US chooses the World Bank president.

Openness and merit don't rule out a European, but they don't sit well with a presumption that Europe will supply the next IMF boss.