Economic growth can be defined as an increase in the capacity of an economy to produce goods and services, compared from one period of time to another. It can be measured in nominal terms, which include inflation, or in real terms, which are adjusted for inflation. Economic development is a wider concept than economic growth and aims for development of human capital, infrastructure, health, literacy rates, and general welfare. It involves both quantitative and qualitative changes in the economy to promote standard of living and economic health. Some key indicators of economic development include GDP per capita, life expectancy, literacy rates, and measures of poverty.