Sir
In different types of market kya hone se yeh sab cheez achieve ho sakta hai
i) 0 wastage hoga
ii) production efficiency hoga
iii) when 0 economic cost
iv) when allocative efficiency
(what is the difference between production efficiency allocative efficiency and 0 wastage)
Like sir these two questions
firstly there will be no condition in which economic cost is zero. as eco cost include acc cost and if we producing something then accounting cost can’t be zero.
now 0 wastage means production is running in fully and efficiently manner machine is producing its max output no waste of raw material. prodution efficiency achieve when additional labour is producing the same output which on an average all the labours are producing so in this case average cost will become equal to marginal cost. so answer to your first ques of image is AC=MC.
allocative efficiency achieve when MC=AR