what do you understand by rotation in ppc

When only one intercept of PPC changes, it is referred a rotation in PPC. 

For example, When there is an improvement in the technology available for the production of Good Y, then the PPC rotates around the y-axis (from A to C, while the intercept at the x-axis will remain the same as technology for the production of Good X remains the same). Since, with the given amount of resources, use of efficient technology to produce Good Y will increase the amount of  Good Y that can be produced. 

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