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How does physical water scarcity compare to economic water scarcity?

Physical water scarcity is caused solely by droughts, while economic water scarcity is caused by humans' contamination of water.

Physical water scarcity is caused by a natural lack of water in an area, while economic water scarcity is caused by a region's inability to afford water.

Physical water scarcity is caused by humans' contamination of a water source, while economic water scarcity is caused by the lack of natural water sources in an area.

Physical water scarcity is caused when there is naturally a lack of water in an area, while economic water scarcity is caused when humans alter a once useable water source.