Is The Pandemic Worse In Lower-Income Countries?

It seems obvious that the COVID-19 pandemic must be worse in lower-income countries. After all, it seems as if the opportunities for social  distancing must be lower in urban areas in those countries, and the resources for everything from protective gear to hospital care must be lower. There are certainly cases where the pandemic has hit some areas hard outside of  high-income countries: for example, the current situation in India, or the city of Manaus in Brazil that suffered a a first wave, and then suffered a second wave with a new variant of COVID.  

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But that said, Angus Deaton (Nobel '15) makes a case that the areas outside the high-income countries of the world have, as a group, been less affected by the pandemic in "Covid-19 and Global Income Inequality" (Milken Institute Review, Second Quarter 2021, pp. 24-35). As a starting point for his argument, consider this figure, which shows countries with higher per capita income have tended to have higher per capita COVID-19 deaths. 

Deaton discusses this figure from a variety of angles,  including the possibility that COVID-19 is less well-measured in lower-income countries. But he argues that a number of other factors may help to explain the pattern of higher COVID-19 deaths in higher-income countries. 

The low number in low-income countries has been linked by Pinelopi Goldberg and Tristan Reed to (the lack of) obesity, to the smaller fraction of the population over 70 and to the lower density of population in the largest urban centers.

Another alternative is to focus on demography. Patrick Heuveline and Michael Tzen provide age-adjusted mortality rates for each country by using country age-structures to predict what death rates would have been if the age-specific Covid-19 death rates had been the same as the U.S. The ratio of predicted deaths to actual deaths is then used to adjust each country’s crude mortality rate. This procedure scales up mortality rates for countries that are younger than the U.S. (Peru has the highest age- and sex-adjusted mortality rate) and scales down mortality rates for countries like Italy and Spain (which had the highest unadjusted rate) that are older than the U.S.

If Figure 1 were redrawn using the adjusted rates, the positive slope would remain, though the slope showing the relationship between death rates and income would be reduced from 0.99 to 0.47 — that is, the relationship would hold but would be less pronounced. ...

[P]oor countries are also warmer countries, where much activity takes place outside, and there are relatively few large, dense cities with elevators and mass transit to spread the virus. It is also possible that Africa’s long-standing experience with infectious epidemics stood it in good stead during this one. People in countries with more-developed economies consume a higher fraction of income in the form of personal services, which makes infection easier.
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