摘要:Vaccines for COVID-19 were developed and produced at unprecedented speed. Yet more than nine months after multiple vaccines were shown to be safe and effective, less than half of the world’s population and only 8 percent of people in Africa have received a shot. Such delays in vaccination during a pandemic are extremely costly in both human and economic terms. Each month in 2020 and early 2021 COVID-19 killed about 300,000 people; it is expected to reduce global GDP by $12 trillion in 2020 and 2021, according to IMF projections, which works out to roughly $500 billion a month. More comprehensive estimates of harm, including losses from interrupted investments in health and education, are many times larger (Cutler and Summers 2020).