By 2040, people in developing countries will continue to spend a greater proportion of their own money on healthcare than those in the developed world as national health spending is failing to keep up with demand, a Lancet study warns.

The researchers say that low-income countries only spend around 3 US cents on health for each dollar that rich countries spend. This is unlikely to change in the next 25 years despite growing wealth, according to the paper.

This means people living in these countries will have to spend a larger share of their own income on private healthcare than those in rich countries — or forego