Describe the key structural differences between the economies of the United States and China. What are the main sources of economic growth in each of these economies? [Structural differences could be due to factors of production, macroeconomic policies, demography, socio-economic environment, etc.] How do these differences impact the countries' economic growth rates and development indicators?[You can cite data, talk about development/social measures that are different across these countries due to differences in economic growth.]