Is indefinite exponential economic growth possible? Economic growth is frequently expressed as a % of GDP.  Proponents of a steady-state economy postulate that perpetual exponential economic growth is impossible and that any system relying on it is inherently unstable. Is this true?

Is indefinite exponential economic growth possible?

(See also: Are there fundamental reasons why (exponential) economic growth is highly desirable?)
As Steven Landsburg pointed out, indefinite anything isn't possible given the eventual heat death of the universe.

Von Neumann posited machines capable of indefinite growth in population (and theoretically production and consumption), so in theory, it would be possible for a time.

Sagan's Response however argued if such things existed that we would have already observed them, and that they would destroy whole galaxies en masse.

That's probably the closest answer you can get to a question like this.