please explain :

9. Explain the concept and meaning of General Equilibrium (of production and exchange) and Welfare Economics. Explain where and how Maximum Welfare will be achieved. PY what is meant by the "inection point" in the production function? B. What is meant by \"social loss\" from the result of the monopoly market. C. What is meant by the shut down point of a company? D. What is meant by an isocot or budget line ? e. What is meant by producer equilibrium? 10. Explain how the consumer equilibrium occurs and consumers who consume two kinds of goods using an indifference curve 11. Explain the concept of substitution effect, income effect, and price effect in consumer behavior analysis