Like money, financial instruments may be "backed" by state military fiat, credit (i.e. social capital held by banks and their depositors), or commodity resources. Governments generally closely control the supply of it and usually require some "reserve" be held by institutions granting credit. Trading between various national currency instruments is conducted on a money market. Such trading reveals differences in probability of debt collection or store of value function of that currency, as assigned by traders.
When in forms other than money, financial capital may be traded on bond markets or reinsurance markets with varying degrees of trust in the social capital (not just credits) of bond-issuers, insurers, and others who issue and trade in financial instruments. When payment is deferred...