What the author doesn't mention is that continual 3% or 2% growth represents exponential, not linear, growth of an economy. It can't continue indefinitely. If

What the author doesn't mention is that continual 3% or 2% growth represents exponential, not linear, growth of an economy. It can't continue indefinitely. If my economy is growing, this year's 2% growth requires substantially more innovation and resources than last year's 2% growth, simply because it's a larger pie.