Macroeconomics and National Income Accounting

Macroeconomics is the branch of economics that focuses on large-scale or general economic factors.
Major areas of study include interest rates and national productivity.

National Income Accounting is a bookkeeping system used by governments to measure the level of a country's economic activity within a specific time period.

This model represents the movement of goods, services, and money throughout the economy.
There are two major actors in this system: households and firms.
Firms provide goods and services for households to consume.
Firms offer incomes to households in exchange for resources.

There are two primary indicators used to quantify aggregate economic output:
- Gross National Product (GNP)
- Gross Domestic Product (GDP)

GNP is the total value of all goods and services produced by a country's residents and businesses, regardless of where the production takes place.
It serves as an indicator of the financial well-being of a nation's citizens and its multi-national corporations.
The formula for GNP is defined as: $Y = C + I + G + X + Z$
Alternatively, GNP can be expressed as: $Y = \text{GDP} + \text{Net Income Inflow from Overseas} - \text{Net Income Outflow to Foreign Countries}$
Variables in the formula represent:
- $C$ : Consumption
- $I$ : Investment
- $G$ : Government expenditures
- $X$ : Net exports (exports minus imports)
- $Z$ : Net income earned by domestic residents from overseas investments minus net income earned by foreign residents from domestic investments.

GDP measures the total production occurring within the geographic borders of a country, regardless of the nationality of the producer.
It serves as a sound indicator of the overall health of a specific economy.
GDP is often referred to as aggregate demand.

GDP can be measured through three different approaches: spending (expenditure), factor incomes, and value of output.

One method calculates GDP by summing the output of primary sectors: $GDP = \text{Agriculture, Fishery and Forestry} + \text{Industry} + \text{Services}$
The standard expenditure formula is: $GDP = C + I + G + \text{Exports} - \text{Imports}$
Components of the expenditure approach include:
- Consumption
- Government spending
- Investment spending
- Change in value of stocks
- Exports
- Imports (subtracted)

This approach sums the various types of income generated by production: $GDP = \text{COE} + \text{NOS} + \text{Depreciation} + \text{IBTS}$
Components of Factor Incomes include:
- Income from people in jobs and self-employment (e.g., wages and salaries).
- Profits of private sector businesses.
- Rent income from the ownership of land.

This calculates the value added from each main economic sector:
- Primary Sector
- Secondary Sector
- Manufacturing Sector
- Quaternary Sector

Gross Domestic Product:
- 2009 Quarter I: $14,178.0$
- 2009 Quarter II: $14,151.2$
- 2009 Quarter III: $14,242.1$
- 2009 Quarter IV: $14,453.8$
- 2010 Quarter I: $14,601.4$
Personal Consumption Expenditures (C):
- 2010 Quarter I Total: $10,362.3$
- Goods: $3,406.6$
- Durable goods: $1,072.8$
- Nondurable goods: $2,333.8$
- Services: $6,955.8$
Gross Private Domestic Investment (I):
- 2010 Quarter I Total: $1,763.8$
- Fixed Investment: $1,726.9$
- Nonresidential: $1,371.3$
  - Structures: $417.5$
  - Equipment and software: $953.9$
- Residential: $355.5$
- Change in private inventories:
- 2009 I: $-127.4$
- 2009 II: $-176.2$
- 2009 III: $-156.5$
- 2009 IV: $-23.6$
- 2010 I: $36.9$
Net Exports of Goods and Services (X-M):
- 2010 Quarter I Total: $-499.4$
- Exports: $1,729.3$
- Goods: $1,180.0$
- Services: $549.3$
- Imports: $2,228.7$
- Goods: $1,827.8$
- Services: $400.9$
Government Consumption Expenditures and Gross Investment (G):
- 2010 Quarter I Total: $2,974.7$
- Federal: $1,186.4$
- National defense: $805.6$
- Nondefense: $380.7$
- State and local: $1,788.3$

Final Goods: Also known as consumer goods, these are goods ultimately consumed by the user rather than being used as components to produce other goods.
Intermediate Goods: Goods used in the production process to create other goods.

Nominal GDP: This is the GDP evaluated at current market prices. It reflects changes in market prices due to inflation or deflation during the current year.
Real GDP: This is the GDP evaluated at the market prices of a specific base year to filter out the effects of price changes.
GDP Deflator: A conversion factor that transforms real GDP into nominal GDP. In the base year, real GDP equals nominal GDP, making the GDP Deflator exactly $100$ .

Inflation Rate: If the percentage change in the GDP deflator over a period is positive ( $X\%$ ), that value represents the inflation rate.
Deflation Rate: If the percentage change in the GDP deflator over a period is negative ( $X\%$ ), that value represents the rate of deflation.
GDP per Capita: This is calculated by dividing the total GDP by the total population. It is considered the best measurement of a country's standard of living and reflects the prosperity felt by citizens.
PPP per Capita: This is the purchasing power parity (PPP) value of all final goods and services produced within a country in a given year, divided by the average (or mid-year) population for that year.

Personal Disposable Income (DPI): The amount of money households have remaining for spending and saving after income taxes are paid.
GDP Limitations: GDP fails to account for several factors, including:
- Income distribution.
- Costs of high output levels, such as pollution.
- Value of leisure time.
- Informal transactions and illegal activities.

Price Index: Indicates changes in the cost of purchasing a specific bundle of goods in a given year relative to a base year.
Consumer Price Index (CPI): Specifically measures the change in the cost of purchasing a bundle of goods typically bought by an average household.