utility = cost(operation) - cost(occupancy)
For shipping, in contrast, there is no occupancy requirement, so the gain is greater: utility = cost(operation) Term Count
iPhone 64
Mac/macOS 17
Services 16
iPad 15
Watch 8
(http://seekingalpha.com/article/4014922-apple-aapl-q4-2016-r...) return all([is_valid_answer(q, a) for q, a in params])
It seems to me that the original misinformation on this subject has caused a continued belief that masks are not helpful in reducing transmission. Initial public health recommendations cannot easily be walked back. Once the meme is sufficiently embedded, it's nearly impossible to dislodge.