It may seem like USPS is forever changing their rates. However, they are bound by US law not to increase more than consumer inflation (average across increases) without special permission. This means that rather than getting infrequent large prices increases, there seems to be annual moderate ones instead. Other carriers are not bound by this law. This makes choosing USPS a more stable long range sales cost/fee.

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This section is drawn from
http://www.gregathcompany.com/service/marketing/bookselling.html

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