What is the best thing to read on why Astra Zeneca and Pfizer/BioNTech are NOT surging vaccine production in 2022?

What is the best thing to read on why Astra Zeneca and Pfizer/BioNTech are NOT surging vaccine production in 2022? Fear of excess capacity? Key bottlenecks? Playing for advantage?
thedailyshot.com/2021/12/10/the… https://t.co/CcMWimHNwE

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