Answer:
decrease in labor supply as some workers leave the afflicted area
Explanation:
According to my research on different effects of natural disasters, I can say that based on the information provided within the question this is most likely a result of a decrease in labor supply as some workers leave the afflicted area. Like in everything in economics price is dependent on supply and demand. After a natural disaster demand is extremely high and supply of workers is most likely low, which leads to higher wages for those that are available.
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