Answers

2016-03-23T01:26:17+05:30
The  Average Cost Curve is 'U' shaped,both in the 'short run
' as well as in the 'long run.' In the short run,it is due to the application of the 'Law of variable proportion.'However,in the long run,it is due to 'internal economies and diseconomies."

I hope I made it clear to you. :)
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