From the late archaic period, all the functions of money – medium of exchange, measure of value, store of value, and medium of payment – were performed by coins, almost always silver, struck by scores of states on a few different weight standards. Market trade, international commerce, and labor were all mediated by money. Finance was an important, and often decisive, factor in statecraft and warfare, and temples were both dependent upon and replete with silver and gold. Agriculture was less monetized; cultural effects are still being debated. Credit was an essential part of both friendship and business: mortgages and eranoi (joint loans by an ad hoc group of lenders) supplied extraordinary personal expenses, while small market loans and larger bottomry loans for overseas expeditions financed both large and small commerce. Banking, in the sense of investing depositors’ money, was a Greek invention. Athenian banks, always family businesses, provided credit, remote payments, money-changing, and a secure place to hide money. Ptolemaic royal banks managed royal revenue and were involved, alongside private bankers, in the local economy; cashless book-transfers were common. The scope of banking was, however, limited by the need for coin reserves, which kept the banks from dominating the economy.