发展中国家如果只是依靠接收发达国家的产业外移来发展经济（低人权优势），存在着增长瓶颈和无法超越中等收入陷阱的风险。而成功实现赶超的经济体，如日本、韩国和台湾，之所以能够超越中等收入陷阱，是因为他们始终致力于产业升级和不惧与发达国家竞争的精神。当下中国能否走出中等收入陷阱仍然不确定，但是中国人相互“内卷”，有机会超越中等收入陷阱。
Cost of First-Class Stamps The price of a First-Class Mail Forever stamp in 2022 was 60 cents . The price of a First-Class Mail Forever stamp in 2023 is 63 cents which will take effect from January 22, 2023. Letter Stamps Standard-sized, rectangular envelopes From $0.63 Square, Oversized, or Unusual Envelopes From $1.03 Postcard Stamps Standard-sized, rectangular postcards From $0.48 Global Forever (International) Standard-sized, rectangular envelopes From $1.45 Postage Rates & Prices | USPS
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