> At some point you reach the physical limit of the system and exponential growth ends. This is true even for digital systems if the digital good involves some

> At some point you reach the physical limit of the system and exponential growth ends. This is true even for digital systems if the digital good involves some physical resource like energy, storage space, bandwidth, etc. At some point well before that, the sun will go red giant and swallow earth, so that's sort of beside the point. In the meantime, if we continue to fuel GDP growth via inefficient use of non-renewable natural resources, we'll have big problems far sooner than any astrophysical limit sets in.