What is the biggest indicator of a rise in the standard of living of a country?

The biggest indicator of a rise in the standard of living of a country is typically an increase in per capita income or Gross Domestic Product (GDP) per capita. This metric reflects the average economic output per person, suggesting improved access to goods and services. Additionally, factors such as enhanced education, better healthcare, and lower poverty rates also contribute to a higher standard of living. These elements collectively indicate overall improvements in quality of life and well-being.