Long Term Economic Growth

The long-run growth is measured as the increase in real GDP per capita and this measure has changed over time and it also varies across countries. A country’s standard of living depends on its ability to produce goods and services (productivity).

How do we measure long-term economic growth of a country? What are the key determinants of long-run economic growth?
What is the relationship between economic growth and productivity? What is the major source of growth in labor productivity?