The World Bank regularly updates the global poverty line to reflect changes in prices and living standards across the world. The new $3.00 line is based on the median poverty lines of 28 of the world's poorest countries, using 2017 PPPs. This represents a significant shift from the previous $2.15 line, which was based on data from 15 countries in the 1990s.

It's important to note that the concept of poverty is complex and multifaceted, and various methods are used to measure and define it. The World Bank's global poverty line is a useful tool for tracking extreme poverty and monitoring progress towards global development goals.

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