However, it is not quite the bargain it once was. Heres a table justifying an increase:
https://www.uspsoig.gov/sites/default/files/reports/2024-03/risc-wp-24-004.pdf

At first blush, it appears that the USPS charges among the lowest rates in the world, but, thats partly because of their selection criteria, eliminating all but 31 of 195 Universal Postal Union member countries for which they had data.
Of the 195 countries in the UPU dataset, 131 of them exceeded the threshold of 4,000,000 hectares (15,444 square miles).³² In addition, 57 of the 195 countries exceeded the threshold of $10 USD in postal operating revenue per capita.³³ After applying the two thresholds, 42 countries remained in our tentative sample. Of the remaining 42 countries, we excluded ten that lacked data necessary to adjust rates for purchasing power parity and an eleventh country because of inconsistencies in the rate data.³⁴ Overall, 164 countries out of the 195 countries in the original dataset of UPU domestic rates were excluded, yielding a sample of 31 countries (See Table 1).
In case youre wondering, some research turned up a more inclusive list; and; by a strange coincidence, eliminated countries seemed to charge less than the USPS.