aegina alloy ancient egypt assignat attica babylon banknote bankruptcy barley barter cast coinage civil society code of ur-nammu coin coincidence of wants commodity commodity money company scrip copper credit card credit money currency debt diocletian economic growth economics economy electrum eshnunna exonumia fiat currency fruit giro gold gold standard greece gulf war hammered coinage hammurabi harvest history history of coins history of the united states dollar history of the rupee inflation ionia iron isaac newton isin jewellery latin laurium legal tender lipit-ishtar list of circulating currencies local exchange trading systems local currency lydia manillas market medal mesopotamia metrics milled coinage money money supply mytilene new south wales notaphily numismatics old french open market operations persian empire pierre marteau precious metal price system red ochre representative money ripe roman empire roman currency rome rum saddam hussein scripophily seigniorage shekel silver slave beads sparta sterling silver stock sumer swap swaziland temple time-based currency token coin touchstone trade united states united states dollar ur value wheat wikimedia commons wine