Conducts research and collects data on the global history of labour, workers, and labour relations

"Cash coins" originate from third-century BCE China

Two porters below and ten cash coins above, suggesting monetary payment for merchandise and its transportation, as shown on a sheet of “exchange media”, a form of paper currency with a value of no less than 770 hundred-cash strings or 77,000 cash coins, printed in Sichuan during the Northern Song period (960-1127 CE).