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Hi Ko-Yung Tung. The short answer is inflation.  The $1.00 international poverty line was set in 1990, based on the costs of basic food, clothing, and shelter in the poorest countries in 1985. The poverty line was reset to $1.25 based on 2005 prices and reset at $1.90 in 2015 based on 2011 prices.  The real value of $1.90 in today's prices is the same as $1.25 was in 2005. Check out these FAQs for more on this. And, for a more in-depth explanation, read this blog post: The international poverty line has just been raised to $1.90 a day, but global poverty is basically unchanged. How is that even possible?

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