In-depth Notes on Functions of Money and Banking Concepts

Functions of Money: Money serves three primary functions in an economy.
- Medium of Exchange: Facilitates buying and selling without the inefficiency of bartering.
- Example: Instead of trading goods directly (e.g., cows, laptops), money is used to simplify transactions.
- Store of Value: Retains value over time and can be saved.
- Example: Money in a bank account represents accumulated value which can be used later.
- Unit of Account: Provides a standard unit for pricing goods and services, allowing for easy comparison.
- Example: Prices in dollars in the U.S. make it simpler to understand the cost of different items.

Commodity Money: Physical goods used as money due to their intrinsic value.
- Historical examples: Gold, silver, and even cigarettes in prison settings serve as money.
- Drawbacks: Difficulties in transportation and divisibility.
- Example: Unable to divide cows for partial transactions.
Commodity-Backed Money: Paper currency backed by a physical commodity like gold.
- Ensures that the paper note represents real value (e.g., a certificate for a gold bar).
- Example: The U.S. dollar was once backed by gold until around 1974.
Fiat Money: Currency with no intrinsic value but is accepted as money due to government decree.
- It functions effectively if the government is trustworthy.
- Concerns include inflation if too much currency is printed (e.g., Zimbabwe).

Bretton Woods System: Post-World War II system where currencies were pegged to the U.S. dollar, which was backed by gold.
- This system faced challenges and eventually collapsed.
- Current fiat currencies derive their value from public trust and government backing.
Cryptocurrency: Emerging form of currency that some businesses accept, though it's not widespread.
- Reflects a growing trend in monetary exchange diversifying beyond traditional fiat currencies.

Money Creation: Banks are crucial in the money supply through deposits and loans.
- When you deposit money, the bank owes you that amount (liability).
- The bank can loan out a fraction of deposits, effectively "printing" new money.
- Example: If total reserves are $200 and loans are $800, the money supply increases as loans are made.
Bank Balance Sheet: Includes assets (what the bank owns) and liabilities (what it owes).
- Assets: Reserves, loans, securities, property.
- Liabilities: Customer deposits.

Reserve Ratio: The percentage of deposits banks are required to keep as reserves.
- Calculated as Total Reserves / Total Deposits.
- Example calculation: If a bank has $200 in reserves and total deposits of $2000, the reserve ratio is 10% (i.e., $200 / $2000).

Money’s functionality and the evolution of different money types are key components of economic theory.
Understanding these concepts, along with banks' roles, is fundamental to grasping how modern economies operate.