My understanding of it is that because we are not letting travellers in, it means there are much less incoming international flights. Most of the mail travels on said flights and with so few planes coming in, mail capacity is reduced. Locking the borders is loke putting a fence up without a gate. Sure it keeps undesirables out like viruses etc, but it also keeps the delivery guy out.....
I am not saying open the borders. I am saying there are costs to society that are a consequence of these actions and as a society we have to figure out which costs are worth it and which ones are too high..
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