The claim that China abuses the cost of sending small parcels internationally, particularly within the UK, stems from the way the Universal Postal Union (UPU) treaty, which governs international postal rates, is structured. This system allows for low-value, small parcels to be sent at a lower rate per kilogram, which can be subsidized by the Chinese government. This can lead to situations where Chinese retailers can send thousands of small packages to the UK for a lower price than what UK-based retailers face, potentially distorting the market and negatively impacting UK businesses