Economic Impact of the 1918 Epidemic of Spanish Flu

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Over the course of history, illnesses and pandemics have had a tremendous economic impact. Economic historians often struggle to calculate the economic impact of these events however, due to the lack of accurate records. The exception is the flu epidemic of 1918, which had a long lasting and significant impact on the world economy. In a ten month period stretching from late 1918 into early 1919, over 40 million people worldwide died as a result of the flu epidemic, about 4% of the world’s population. In comparison, the AIDS epidemic has killed 25 million people since 1981. In the United states alone over 700,000 people died, which is greater than the total number of American deaths in both World Wars, The Korean War, and Vietnam, combined. One of the major takeaways from studying the flu epidemic is that it offers a real life example of what impact population shocks have on economies. Major plaques such as the black plaque lack the data required to arrive at a conclusive analysis, while economic theory is too ambiguous to accurately model the situation. In the case of the 1918 flu epidemic, known commonly as the Spanish Flu, records exist which allow economists to draw conclusions on the impact of population shocks on the world economy. With every pandemic, the initial result is the death of a substantial portion of the population of the impacted area. Typically, the majority of those who die as a result of the flu are the elderly, and children. Under normal circumstances, this leaves the majority of the working class intact, and any major economic impact is spared. However, the 1918 flu epidemic is unique in that the majority of those who died were of working ages, between 15 and 50. Also, males were disproportionately more likely to die due to flu related causes. During this time period men dominated the workforce. As a result, the employed population was hit hardest, leading to a substantial economic impact. Traditional economic thought states that in an area where population declines at a rapid rate, the overall prosperity, commonly measured in GDP per person, will increase. This is because the supply of labor decreases, and as a result wages increase due to a leftward shift of the supply curve. In 2003, Elizabeth Brainerd and Mark Siegler published a study aimed at discovering whether the Spanish flu followed the theorized path. They were able to compare personal incomes in 1921 to those in 1930, before the Great Depression impacted incomes.

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