Hello, can you be fast and provide me with these explanations. Kindly cite.

1) 'Economics of imperfect competition' is the book written by

2) In 1946 a University appointed W. W. Leontief as the professor of Economics. Name the University

3) Paul A Samuelson won the Nobel prize in economics in which year?

4) In 1990 the number of economists share the Nobel prize for economics are________

5) The country with the highest GDP in world is _________

6) The country with the lowest GDP per capita in the world is _________

7) The country with the largest per capita income is _________

8) Define 'Demand for a Commodity'?

9) In USA how many percentages of GDP have the contribution from agriculture?

10) The country having the highest daily calorie intake per capita is _______

11) Highest indebted nation in the world is _________

12) A nation with high income is found to be the highest consumer of per capita energy. Mention the country.

13) Name the nation where the whole population is urban in nature?

14) The country in which the death rate is very low in the world is ________

15) Infant mortality rate is highest in a developed nation. Mention the country

16) 'Science which studies human behaviour as a relationship between ends and means which have alternative uses.' Which economist defined Economics as this?

17) The country having the largest life expectancy of birth in the world is Japan. How much is the life expectancy?

18) For the third world nations the biggest source of help is _______

19) Which country is the highest producer of milk in the world?

20) Most number of German cars are exported to which nation?