They also grow at similar rates, so the ratio of the aggregate capital stock to output or GDP does not change much over time. The return to capital, i.e.An economy grows when it has the capacity to produce more. Production is based on how much capital, labor, natural resources, and technology it has to produce. Net operating surplus plus consumption of fixed capital is equal to gross operating surplus. Economy: Some tangible facts and intangible fictions. National statistical offices and central banks from countries through- out the world made valuable contributions. Consumption of fixed capital (CFC).