Something I have no knowledge of that the article could have mentioned precedent for is the expected waste observed in existing vaccination efforts. How much sh

Something I have no knowledge of that the article could have mentioned precedent for is the expected waste observed in existing vaccination efforts. How much shrinkage due to the factors involved with "wasted" COVID vaccines is there with the flu vaccine which is not in a phase of initial scarcity? What is the prior and how different is the observation in this case?