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When TR curve is parallel to X axis , what is the shape of demand curve and MR curve ?

Judanne,

When TR curve is parallel to X- axis, then MR is zero. Therefore, MR curve is also a horizontal straight line and coincides with the output-axis.


When TR curve is parallel to X-axis, then the demand curve will be downward sloping.



 
 

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Demand curve or AR curve will slope downwards from left to right because horizontal TR indicates that TR remains same at levels of output.
And MR curve coincides with x-axis in such a case,as revenue from additonal commodity is zero.
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