By George Chen
The opinions expressed are the author’s own.

You may think I am overly cynical today but let me first ask you a simple-yet-complicated question — what is fair?

Global ratings agency Moody’s said yesterday that the United States will retain its top AAA credit rating after President Barack Obama signed a bill to raise the federal debt ceiling. However, we heard very different opinions from China on the credit rating of the world’s No.1 economy.

A Chinese ratings agency yesterday downgraded the U.S. from A-plus to A, saying the deal to lift the debt ceiling would not solve underlying U.S. debt problems or improve its debt-paying ability over the long term.

Dagong Global Credit Rating, a relative newcomer to the sovereign debt rating realm and little known outside of China, said in a statement that the U.S. decision to raise the borrowing ceiling would  not change the fact that the growth of its debt had outpaced overall economic growth and fiscal revenue.

Global ratings agencies are “unrealistic” in their assessment of U.S. credit, overestimating the ability of the U.S to pay off debt, Dagong’s chairman Guan Jianzhong told our correspondent Lucy Hornby in Beijing. Click here to watch the full TV interview online, brought to you by Reuters Insider.