[sarbaz]

It's a relatively natural consequence of the fact that doing work creates value. One of the things you can work towards is creating more workers (by creating more humans, or better efficiency, or robots). Because these processes are basically exponential, you expect to see constant neverending growth.

The only real physical limit to productivity is our energy input. When we create things, we use energy and time to turn raw materials into useful stuff. Today most of our energy comes from the plants we eat (ie the sun) and from the ground. But we are not close to using even a small fraction of the energy that the sun gives us, so there is still lots of room to grow.

[twic]

There may well be reasons to expect growth to continue forever. But i am asking if there are reasons to require it to continue forever.