Of the four methods for growing an economy, which one or ones do you feel are responsible for the economic growth in the U.S., Brazil, China and

Of the four methods for growing an economy, which one or ones do you feel are responsible for the economic growth in the U.S., Brazil, China and India? Explain your reasoning based on the economic principles and concepts we have examined this week by connecting one or more of the four methods that shift the production possibility frontier (PPF) to the data you have found for each country.