The Economist who developed Human Development Index (HDI) is Mahbub Ul Haq.

Mahbub Ul Haq was a Pakistani economist who served as the Finance Minister of Pakistan in the 1980s. He was a strong advocate of human development and believed that GDP alone was not a sufficient measure of development. He developed the Human Development Index (HDI) in collaboration with Amartya Sen, an Indian economist, in 1990.

What is Human Development Index (HDI)?

The Human Development Index (HDI) is a composite statistic of life expectancy, education, and per capita income indicators, which are used to rank countries into four tiers of human development. It was developed as an alternative to the traditional economic measures of Gross Domestic Product (GDP) and Gross National Product (GNP), which only measure economic progress and do not take into account the social and human aspects of development.

How is HDI calculated?

The HDI is calculated using three dimensions of human development: health, education, and income. It takes into account the following indicators:

1. Life expectancy at birth
2. Mean years of schooling
3. Expected years of schooling
4. Gross national income (GNI) per capita

These indicators are combined to create a single index value ranging from 0 to 1, with a higher value indicating higher human development.

Conclusion:

Mahbub Ul Haq's contribution to the field of economics and development is significant. His work on human development and the creation of HDI has helped shift the focus of development policies from economic growth to a more holistic approach that considers the social and human aspects of development. The HDI is now widely used by governments, international organizations, and researchers as a measure of development and progress.

Pakistani economist Mahbub ul Haq created HDI in 1990.This is still used to measure the country's development by the United Nations Development Program (UNDP) every year.