If appointments are being cancelled, then the system as it exists is regressing. Cities that could continue the pace that led to 0 to 1m/day are not being given enough doses to maintain that pace. Essentially the 1m/day pace was possible because for the first few weeks, many vaccines were delivered but not administered, so there was supply to go through (which also means averaging probably gives you a better picture of the overall state). Once those doses are administered, the vaccination rate will fall. According to some reports, Pfizer and moderna together are manufacturing 4.5 million doses a week at close to max capacity, which doesn’t get you to 100 million in 100 days even if they can maintain production.
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