U.S. markets butted against a stubborn ceiling for another week, ending up Friday where they were a week earlier after five days of jerky but finally inconclusive trade.

The S&P 500 could claim a seventh straight weekly gain -- by adding just 0.1 percent -- but that just underscored the stall of the bull run since December.

G20 finance ministers on Saturday moved to calm fears of looming "economic warfare" on the currency markets, pledging they would not target specific forex rates or devalue currencies to make them more competitive.

The jitters -- similar to previous disputes with China -- have been set off by Japan's plan of monetary easing to boost inflation and activity by reducing the value of the yen under new Prime Minister Shinzo Abe.

Finance ministers from G20 states gathered Friday in Moscow for their first meeting in the Russian capital aimed at reassuring markets that the world's economic powers would not slug it out in "currency wars" to boost national growth.

The troubles of the debt-ridden eurozone will for the first time in several international meetings not be centre stage, with the main concern expected to be Japan's controversial plan for "monetary easing" that weakens the yen.

French President Francois Hollande wrapped up his two-day trip to India on Friday with a call for more investment and trade between the countries as he met with business leaders.

Hollande, making his first trip to Asia since taking office last year, said that trade between India and France was barely 8.0 billion euros ($11 billion) annually -- far from an objective of 12 billion euros set in 2008.

Germany's finance minister on Friday warned of the dangers of countries intervening in the foreign exchange markets, as top officials from the group of 20 met amid fears of a "currency war".

A financial transactions tax to be adopted by 11 EU states should raise 30-35 billion euros each year but the levy will apply worldwide, the European Commission said Thursday, sparking a sharp reaction from opponents led by Britain.

The Financial Transaction Tax (FTT) imposes a tax of 0.1 percent on a trade in shares and bonds, and of 0.01 percent for derivative instruments.

Global demand for gold fell last year in its first tumble since 2009 as demand in leading market India slid, narrowing the gap with second-biggest buyer China, the World Gold Council said Thursday.

Demand for the precious metal was 4,405.5 tonnes for the full year, down 3.85 percent from 4,582.3 tonnes a year earlier, the WGC report said.

American Airlines and U.S. Airways announced a long-expected merger Thursday that would create the largest U.S. airline, giving them more weight in an industry that has steadily consolidated in recent years.

The marriage would establish a huge carrier with more than 1,500 aircraft, able to compete head to head with powerful rivals United Airlines and Delta Air Lines.

Japan's economy shrank for a third quarter at the end of 2012, data showed Thursday, leaving it mired in recession owing to weak export demand, but analysts and the central bank eyed a rosier outlook.

Tokyo saw a 0.1 percent contraction in October-December from the previous three months, underlining the work ahead for Prime Minister Shinzo Abe's new government as it tries to boost growth while fending off claims it is manipulating the yen to lift exports.

The EU and the United States are to negotiate the biggest free trade agreement ever, a global "game-changer," boosting growth and providing much-needed jobs, European Commission head Jose Manuel Barroso said Wednesday.

An accord between the world's two largest trading entities would be "ground-breaking ... a game-changer," which will add 0.5 percent to the EU economy every year once it is in place, Barroso said.