Christine Lagarde is the President of the European Central Bank (ECB). According to the article you mentioned, Lagarde warned in a speech in September 2021 that a potential default by the United States on its debt obligations could lead to a major disaster for the global economy.

The United States is one of the world's largest economies and a major player in global financial markets. A default on its debt obligations could potentially lead to a loss of confidence in the US economy and financial system, which could trigger a global economic crisis.

Lagarde's warning highlights the interconnectedness of the global economy and the importance of maintaining financial stability and sustainability. It also underscores the importance of responsible fiscal policy and the need for governments to manage their debt obligations carefully.

(by Jamie Redman)