Money, Banking, and the Economy

Money, Banking, and the Economy: Lecture 2 Notes

Lecture Overview

This lecture covers the fundamental aspects of money, including its role and types, the concept of liquidity, and an examination of nominal versus real Gross Domestic Product (GDP). It also explores various price indices, their related inflation rates, and practical applications in Excel.

The Role of Money

Money serves several crucial functions in an economy:

• Means of Payment: Facilitates the exchange of goods and services without the need for a "double coincidence of wants" (as in a barter system). It is universally accepted for transactions.

• Unit of Account: Provides a common measure of value for goods, services, and debts. This allows for easier comparison of prices and economic calculations.

• Store of Value: Enables individuals to transfer purchasing power from the present to the future. For money to be an effective store of value, it must retain its purchasing power over time, though inflation can erode this.

• Discussion: Is Cryptocurrency Money? The classification of cryptocurrencies as money depends on how well they fulfill these three roles. While some cryptocurrencies act as a means of payment and unit of account for specific communities, their volatility and limited universal acceptance often challenge their efficacy as a stable store of value or a widely accepted means of payment.

Types of Money

Commodity Money

• Definition: Currency that possesses an inherent non-money value to everyone. Its value is derived from the commodity itself, not merely from its function as money.

• Characteristics:

  • Cannot be easily created: Its supply is limited by the availability of the underlying commodity, making it difficult for governments to manipulate its quantity.

  • Prevents inflation: The limited supply naturally constrains the rate at which prices can rise, assuming the economy's productive capacity doesn't significantly outstrip the money supply.

  • May cause deflation: If the economy expands faster than the supply of the commodity money (e.g., population growth, technological advancements lead to more goods), prices may fall (deflation) due to increasing scarcity of money relative to goods.

• Examples: Gold, shells, cigarettes (often used in prison economies or during wartime when standard currency is unreliable).

Fiat Money

• Definition: Currency with no inherent value of its own. Its value stems solely from the belief and trust that others will accept it as a means of payment, typically backed by government decree.

• Characteristics:

  • Can be easily created: Governments and central banks can increase or decrease the money supply as needed by printing more currency or using monetary policy tools.

  • Risk of inflation: The ease of creation means there is a potential for excessive increases in the money supply, leading to inflation.

  • Money supply can expand as economy expands: This flexibility allows central banks to adjust the money supply to facilitate economic growth without causing deflation.

• Examples: U.S. dollars, Japanese Yen, Euro.

Historical Transition from Commodity to Fiat

Historically, many monetary systems evolved from commodity-backed currencies to fiat systems:

• Early forms of money involved precious metals like gold and silver, which had to be weighed for each transaction.

• To standardize and simplify transactions, goldsmiths began making coins of fixed weight and purity.

• As trade expanded, the physical transportation of large quantities of heavy coins became cumbersome. Merchants would deposit their gold or silver with goldsmiths for safekeeping.

• Goldsmiths would issue 'notes' or receipts as proof of ownership of the deposited coins.

• These notes, being much lighter and easier to exchange, eventually became accepted as a form of payment themselves, representing the underlying gold without needing to physically exchange it.

• Over time, these notes stopped representing a direct claim on specific quantities of gold. Central banks were formed to regulate the issuance of these notes and manage the money supply, thus transitioning to a fiat system.

The Gold Standard

• Definition: A monetary system where a country's paper currency is directly backed by gold. The central bank commits to converting its currency into a fixed amount of gold at a specified price.

• Mechanism: Essentially, the central bank fixes the price of gold (e.g., $35$ per ounce).

• Similar to commodity money: It inherently limits inflation because the money supply is constrained by the amount of gold reserves.

• Limitations:

  • No control over money supply growth: The money supply is dictated by the availability of gold, not by the needs of the economy or monetary policy objectives.

  • Vulnerability to gold market fluctuations: If gold demand rises naturally, the market price of gold will increase. However, under a gold standard, the central bank is obliged to maintain a fixed price. This can lead to a situation where the public becomes less willing to spend their paper money (which represents gold) because its real value in terms of gold is fixed while goods prices may be falling relative to gold's market value. This can lead to deflationary pressures as people hoard gold/money.

  • Loss of Public Confidence: If the central bank cannot maintain the fixed gold price or its reserves are insufficient, it can lead to a loss of public confidence, as seen in instances like 1971 when the U.S. ended the convertibility of the dollar to gold.

Why Not Return to the Gold Standard?

• Impracticality: Returning to a gold standard today is largely considered unfeasible due to the sheer volume of global economic activity and the limited supply of gold.

• Example (2016): To back the Yuan with gold in 2016, China would have required approximately $525,000$ tons of gold. This is significantly more than the estimated total of $182,000$ tons of gold ever mined in human history, highlighting the impossibility of such a system for a major global economy.

Liquidity

• Definition (Implicit): Refers to the ease and speed with which an asset can be converted into the economy's means of payment without a significant loss in value. Highly liquid assets are those that can be quickly and easily used for transactions.

• Current State: Checking accounts and saving accounts are now largely identical in terms of ease of access and transfer, reflecting their high liquidity.

• Future Study: Measures of the money supply, such as $M1$ and $M2$, which differentiate assets based on their liquidity, will be discussed later in the semester.

Gross Domestic Product (GDP)

• Definition: GDP represents the total expenditure, or market value, of all new domestically-produced final goods and services during a specific time period (e.g., a quarter or a year).

• Components: GDP ($Y$) is calculated using the expenditure approach: $Y = C + I + G + NX$

  • $C$: Consumption - Spending by households on goods and services (e.g., food, clothing, education).

  • $I$: Investment - Spending on capital equipment, inventories, and structures, including household purchases of new housing.

  • $G$: Government Purchases - Spending by local, state, and federal governments on goods and services (e.g., national defense, roads, public schools for services).

  • $NX$: Net Exports - The value of a country's exports minus the value of its imports.

Nominal vs. Real GDP

• Nominal GDP: Calculated using current prices and current quantities of goods and services produced. It reflects both changes in quantity and changes in price over time.

• Real GDP: Calculated using base year prices and current quantities of goods and services produced. It measures the volume of output, effectively removing the impact of price changes (inflation) over time, thus providing a clearer picture of economic growth.

• Comparison: Nominal GDP typically grows faster than Real GDP during periods of inflation because it includes the effect of rising prices. The base year is the specific year where Nominal GDP equals Real GDP because the prices used for both calculations are the same.

Price Indices

Price indices are tools used to measure the average change in prices of a basket of goods and services over time. They are crucial for calculating inflation.

• GDP Deflator: The broadest measure of prices, capturing the average price change of all goods and services included in GDP.
  $P<em>{GDP,t} = rac{ ext{Nominal GDP}</em>t}{ ext{Real GDP}_t} imes 100$

  • Scope: Covers all final goods and services produced domestically.

  • Limitation: Ignores prices of imported goods and services.

• Producer Price Index (PPI): Measures the average change over time in the selling prices received by domestic producers for their output.
  $P_{PPI,t}$

  • Scope: Focuses on the wholesale prices of physical goods at various stages of production before retailer markups.

  • Limitation: Does not include services and ignores imports.

• Consumer Price Index (CPI): Measures the average change over time in the prices paid by urban consumers for a market basket of consumer goods and services.
  $P_{CPI,t}$

  • Scope: Based on a typical consumption basket of goods and services directly purchased by consumers.

  • Significance: Widely used to gauge the cost of living and for adjusting wages, pensions, and social security benefits.

• Personal Consumption Expenditure (PCE) Price Index: Measures price changes for goods and services purchased by consumers, similar to the CPI but with different weighting and coverage.
  $P_{PCE,t}$

  • Scope: Based on the prices of all goods and services included in the $C$ (Consumption) component of GDP.

  • Limitation: Ignores houses, which are classified under Investment ($I$) in GDP.

  • Significance: Preferred by the Federal Reserve as a measure of inflation due to its broader coverage and dynamic weighting.

Inflation

Calculation of Inflation Rate

Inflation ($\\pit$) is the rate at which the general level of prices for goods and services is rising, and subsequently, purchasing power is falling. It is calculated as the percentage change in a price index over a period:$\\pit = \frac{Pt - P{t-1}}{P_{t-1}} \times 100$<br>Where:</p><ul><li><p>$P_t$is the price index in the current period.</p></li><li><p>$P_{t-1}$is the price index in the previous period.</p></li></ul><h5 id="dc9bbaf1-4e5e-4dc2-bfec-255568294abb" data-toc-id="dc9bbaf1-4e5e-4dc2-bfec-255568294abb" collapsed="false" seolevelmigrated="true">Issues with CPI</h5><p>While the CPI is a widely used measure of inflation, it has several limitations and potential biases:</p><ul><li><p><strong>Technological Improvements</strong>: It's difficult to account for quality improvements in goods and services over time. A higher price for a technologically superior product might be recorded as inflation, even if consumers are getting more value.</p></li><li><p><strong>Outlet Bias</strong>: The CPI basket traditionally samples prices from specific retail outlets. If consumers shift their purchases to cheaper options like discount stores or online retailers, the CPI might overstate the actual cost of living.</p></li><li><p><strong>Substitution Effect</strong>: The CPI uses a fixed basket of goods for a period. If the price of a good in the basket rises significantly, consumers may substitute it with a cheaper alternative. The fixed basket doesn't immediately reflect this substitution, leading to an overestimation of the true cost of living increase.</p></li><li><p><strong>New Product Bias</strong>: New goods and services are not immediately included in the CPI basket, which delays their impact on the inflation measure. This can lead to an overstatement of inflation if new products offer better value for money than older ones.</p></li></ul><h5 id="09a7b164-3b35-4c08-bbc4-72c03cfeba65" data-toc-id="09a7b164-3b35-4c08-bbc4-72c03cfeba65" collapsed="false" seolevelmigrated="true">Headline vs. Core Inflation</h5><ul><li><p><strong>Headline Inflation</strong>: Refers to the raw inflation figure, including all components of the CPI basket, such as food and energy.</p></li><li><p><strong>Core Inflation</strong>: Excludes volatile components like food and energy prices. Food and energy prices are often subject to significant short-term fluctuations due to factors like weather, geopolitical events, and supply shocks, which can obscure underlying inflationary trends.</p></li><li><p><strong>Significance</strong>: Core inflation is generally considered a better indicator for predicting future inflation and for guiding monetary policy decisions, as it provides a more stable measure of the economy's underlying price pressures.</p></li></ul><h5 id="0a8a3f51-4605-4131-a18d-8cccf4840014" data-toc-id="0a8a3f51-4605-4131-a18d-8cccf4840014" collapsed="false" seolevelmigrated="true">CPI Basket Composition (Historical and Current)</h5><p>The composition of the CPI basket, reflecting consumer spending patterns, changes over time.</p><ul><li><p><strong>CPI Basket (Past Example - When Instructor Started)</strong>:</p><ul><li><p>Housing:$42.4\%$</p></li><li><p>Transportation:$17.4\%$</p></li><li><p>Food and Beverage:$15.1\%$</p></li><li><p>Medical Care:$6.2\%$</p></li><li><p>Recreation:$5.6\%$</p></li><li><p>Other Goods and Services:$3.5\%$</p></li><li><p>Communication:$3.1\%$</p></li><li><p>Education:$3.0\%$</p></li><li><p>Apparel:$3.8\%$</p></li></ul></li><li><p><strong>CPI Basket (June 2025)</strong>:</p><ul><li><p>Housing:$44.36\%$</p></li><li><p>Food and Beverage:$16.564\%$</p></li><li><p>Transportation:$14.459\%$</p></li><li><p>Medical Care:$8.263\%$</p></li><li><p>Recreation:$5.276\%$</p></li><li><p>Education and Communication:$2.943\%$</p></li><li><p>Apparel:$2.493\%$</p></li><li><p>Other Goods and Services:$0.642\%

Summary of Key Calculations (for Excel Applications)

• Nominal GDP: Calculated using current prices and current quantities.

• Real GDP: Calculated using base year prices and current quantities. This calculation effectively removes the impact of inflation from economic output measurements.

• Price Index (e.g., GDP Deflator): Calculated as \frac{\text{Nominal GDP}}{\text{Real GDP}} \times 100$. This calculation effectively <strong>removes the impact of real GDP growth</strong>, isolating price changes.</p></li><li><p><strong>Inflation</strong>: Calculated as$\frac{Pt - P{t-1}}{P_{t-1}} \times 100$, representing the percentage change in a price index over time.</p></li></ul><h4 id="5a29fdcc-f5b3-4bcd-a4a7-23fe60fd1674" data-toc-id="5a29fdcc-f5b3-4bcd-a4a7-23fe60fd1674" collapsed="false" seolevelmigrated="true">Administrative Note</h4><p>Students are required to complete the Discount Factor Survey on Canvas before$11:30$AM on September$3$rd. This survey helps determine each student's discount factor. On-time completion will earn$5$points of extra credit on Review Quiz$1$$.