Briefly discuss the purpose and role that each type of financial institutions (depositary, contractual, and investment) play in the U.S. economy.

Briefly discuss the purpose and role that each type of financial institutions (depositary, contractual, and investment) play in the U.S. economy. How do each of these institutions intersect with the various types of markets, i.e., capital, money, spot (cash), derivatives, Forex and Interbank, primary, and secondary (inclusive of OTC)?