Q.(a) Compare and contrast various definitions of Economics.

(a) Economics has been defined in four successive ways — wealth (Smith), welfare (Marshall), scarcity (Robbins) and growth (Samuelson) — each improving on the last. (b) Tamil Nadu's energy comes from thermal, hydro, nuclear, wind and solar sources, with strong leadership in wind and solar power.

(a) Compare and contrast the various definitions of Economics

1. Wealth definition — Adam Smith (1776, Wealth of Nations): Economics is the science of wealth — it studies how wealth is produced, consumed and accumulated. Criticism: too materialistic; treats wealth as the end and ignores human welfare.
2. Welfare definition — Alfred Marshall (1890, Principles of Economics): Economics is the study of mankind in the ordinary business of life; it examines that part of individual and social action connected with material welfare. Improvement: shifts focus from wealth to human welfare. Criticism (Robbins): limits economics to only material welfare and to measurable actions.
3. Scarcity definition — Lionel Robbins (1932): Economics is the science which studies human behaviour as a relationship between ends and scarce means which have alternative uses. Merit: universal — highlights scarcity and choice; the most widely accepted. Criticism: it is only analytical and ignores economic growth.
4. Growth definition — Paul Samuelson: Economics is the study of how society uses scarce resources to produce valuable commodities and distribute them among different people over time. Merit: dynamic — includes growth and the future, making it the most comprehensive.

Comparison: The definitions show a clear evolution — from wealth → welfare → scarcity → growth — with the scope of economics steadily widening from mere wealth to human welfare, to choice under scarcity, and finally to growth over time.

(b) Various sources of energy in Tamil Nadu

1. Thermal (coal) power — major stations at Mettur, North Chennai, Ennore and Tuticorin generate a large share of the state's electricity.
2. Hydro power — generated at Mettur, Kundah, Periyar, Papanasam and other river/reservoir projects. …