Geneva: An annual survey on competitiveness of the countries across the world has put India at 29th place according to its ability to compete. The United States topped world competitiveness rankings for the 15th straight year, though its economy is showing the signs of weakness. The study was released on Thursday.

Singapore and Hong Kong ranked just behind the U.S., as they did last year. Switzerland jumped two places to fourth, while Luxembourg rounded out the top five most competitive national economies, said the Lausanne, Switzerland based IMD business school, publisher of the World Competitiveness Yearbook.

"The big question is whether the U.S. will be No 1 after this year," project director Stephane Garelli said, adding that the report was based on 2007 data that do not fully reflect all of the problems in U.S. financial markets.

"Everyone is catching up very quickly, but so far the U.S. economy is showing a lot of resilience."

The study lists 55 economies according to 331 criteria that measure how the nations create and maintain conditions favorable to businesses.

Rounding out the top 10 most competitive nations were Denmark, Australia, Canada, Sweden and the Netherlands.

China and India both dropped two places in the report, to 17th and 29th, respectively. Russia fell four spots to 49th.

Venezuela was ranked last for the third year in a row, immediately preceded by Ukraine, South Africa, Argentina and Indonesia.

But Garelli warned that US economic health is vulnerable because of its heavy reliance on the financial sector for corporate profits.