Varied amounts is a good bet. You have a certain amount to pay for objects and bills also have amounts so is easier.
Durable is also good but money can be regained by the bank or job.
Portable is also good but in other times people paid with gold bars which were quiet heavy.
Limited Supply is not it because you need it. So factories keep on producing.
The correct answer is an institution helping to rectify a principal-agent problem
Principal-agent problem addresses the difficulties that can arise in conditions of asymmetric and incomplete information, when a principal hires an agent, such as the problem of potential conflict of interest and moral hazard, as the principal is presumably hiring the agent to pursue the principal's interests.
Various mechanisms can be used to try to align the interests of the agent with those of the principal, such as part payments, commissions, profit sharing, performance measurement (including financial statements), establishing an agent liaison or fear of dismissal.
Archaic
Next oldest is the Poverty Point Culture, which thrived from 1730 - 1350 BC, during the late Archaic period in North America.
