The central issue is that physical goods and services need to be produced around the time that they're consumed, and at a given point in time, an economy has a fixed capacity to generate these goods and services.
If you have a non-producing population, and a producing population, then the only way for the non-producing population to consume a given quantity of goods and services is for the producing population to not consume those goods and services. Whether you call the reduction in consumption ability of the working population "taxes" or "investments" doesn't change this fundamental fact, except insofar as it alters certain behavioral incentives around deferring consumption and legal frameworks around property rights.
(This isn't 100% of the story, since you can "lay claim" to production of working people overseas via international investment, but is accurate in broad strokes.)