What are ‘ridge lines’? What is the relevance of these lines in theory of production? How a rational

What are ‘ridge lines’? What is the concatenation of these lines in system of evolution? How a moderate account minimizes his absorb of evolution for a fond roll of output? Expound the concept of economies of occasion. How are they measured? Derive long-run medium absorb deflexion (LAC) from short-run stock deflexions. Also expound why LAC deflexion is extol than short-run absorb deflexions?