One stamp, 192 countries: the UPU final-mile pact China's parcels exploited

The Universal Postal Union, the UN-affiliated body of 192 countries' postal services headquartered in Bern, runs the settlement that makes international mail work: buy postage at your local post office and a phone travels from Switzerland to a New York doorstep without buying any other country's postage or planning a single route. The system's quiet bargain is the final mile — the most expensive leg, performed by the receiving country's post, which historically was not fully reimbursed.

The founders assumed volumes would roughly balance: everyone takes a turn eating the cost of a lousy final mile. For decades the US was a big winner, exporting sacks of catalogs and junk mail, according to economist Anna Moller Boivie, whose firm studied the flows for the Postal Regulatory Commission. E-commerce broke the balance — knockoff manufacturers in China could mail a Mighty Mug lookalike to New Jersey for $5.69 with free shipping, while the original's maker paid $6.30 to ship it across the street, because UPU rates let foreign posts ship into America below the cost of the last mile.

The settlement figures are treated as sensitive intergovernmental data — 'not supposed to be open to the public', a 16-year UPU official said — and the US Postal Service would neither confirm nor deny interview requests. New Jersey mug-maker Jayme Smaldone, convinced there was 'an international price-fixing conspiracy', mailed a 15-page letter to the White House and kept pushing until Planet Money's 2018 investigation concluded the conspiracy was real, just boring.

One-price-everywhere required someone to absorb the expensive leg, and the UPU chose mutual trust over full reimbursement.

The imbalance was invisible while flows were symmetric — exported junk mail made the US a net winner for decades.

E-commerce made flows massively asymmetric, turning the subsidy into a price floor for foreign competitors.

Rates set at closed congresses meant outsiders like Smaldone had to reverse-engineer the scheme from a red mug.

A clearing union can run a global network on trust — until flows stop balancing. Then the settlement terms, not the service, become the fight.

The system survived, with the UPU still adjusting terminal dues amid complaints about who eats the final mile, and its rate figures still handled as confidential state-like data rather than public prices.