When Thomas L Friedman argues that the world is "flat", he's not talking about the literal shape of our planet. He's using a metaphor to describe a globalized world where the playing field is more level than ever before.

Here's what he means:

* Technology is breaking down barriers: The internet, mobile devices, and other technologies have made it possible for people all over the world to communicate and collaborate with each other instantly and cheaply. This has flattened the playing field for businesses, individuals, and even nations.

* Competition is more intense: With a global marketplace, businesses and individuals face competition from all over the world. This means that everyone needs to be constantly innovating and improving to stay ahead.

* Globalization is creating a more interconnected world: People are now more aware of and connected to the world around them than ever before. This can be seen in the rise of global movements, the spread of information, and the increasing interconnectedness of economies.

Friedman argues that this "flat" world brings both opportunities and challenges. On the one hand, it allows for increased collaboration, innovation, and economic growth. On the other hand, it can lead to job displacement, increased competition, and the need for constant adaptation.

In summary, Friedman's "flat world" is a metaphor for a world where globalization and technology have made the playing field more level, leading to increased competition and interconnectedness.