The correct option is all of the above.
When the production possibility curve shifts shifts inwards, it means that there is a negative effect on the economy and as such the economy is shrinking due to the fact that the allocation of resources is not efficient.
Based on the options given, some of the reasons that will cause the PPC to shift in, closer to the origin include:
- a natural disaster that destroyed resources,
- a plague that resulted in widespread death.
- the internet broke.
In conclusion, all of the options are correct.
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