National income is the sum of all factor incomes (wages, rent, interest, and profit) generated by the production of goods and services in an economy over a specific period, usually one year.

Real GNP per capita measures the average economic output per person. When the total real output of an economy grows faster than the number of people in the population, the amount of output available per person increases. This is the fundamental requirement for improving the average standard of living within a nation over time.

Nominal GNP measures the value of all final goods and services produced by a country's residents, valued at the prices prevailing during the period in which the production takes place. Unlike Real GNP, which adjusts for inflation by using constant base-year prices, Nominal GNP is calculated using current market prices. Consequently, it reflects both changes in the volume of output and changes in the price level over time.

Economic growth is calculated by finding the difference between the current year's GDP (GDPc) and the previous year's GDP (GDPp), dividing that difference by the previous year's GDP, and multiplying by 100 to express it as a percentage. This provides the rate of change in economic output over the specified timeframe.

A balance sheet is a financial statement that summarizes a company's assets, liabilities, and shareholders' equity at a specific point in time. It functions as a snapshot of the company's financial position by listing accounts under broad categories, reflecting the fundamental accounting equation where assets equal liabilities plus equity. It is distinct from an income statement, which measures performance over a period.

The CPI measures the price of a basket of goods purchased by typical consumers, including imported goods. The GDP deflator only measures the prices of goods and services produced domestically. If the price of an imported good like a BMW increases, it directly impacts the CPI because it is part of the consumer basket, but it does not affect the GDP deflator because it is not produced within the country's borders.

Gross National Product (GNP) measures the total value of all finished goods and services produced by a country's residents, regardless of where the production occurs. While GDP is more commonly used for domestic output, GNP is often cited as a measure of the total income earned by a nation's citizens, including income from foreign investments, providing a broader perspective on national economic prosperity.

Gross Domestic Product (GDP) is the total market value of all final goods and services produced within a country's geographic borders during a specific time period. It focuses on final output to ensure that the value added at each stage of production is counted only once, excluding intermediate goods used in the production process.

Gross Domestic Product (GDP) is the total monetary or market value of all finished goods and services produced within a country's borders during a specific time period. It serves as a comprehensive scorecard of a country’s economic health. By focusing on production within geographic boundaries, it distinguishes itself from Gross National Product (GNP), which measures the output of a nation's residents regardless of where they are located globally.

Substitution bias occurs because the CPI is calculated using a fixed basket of goods. When the price of one item in the basket rises, consumers naturally substitute it with cheaper alternatives. Because the CPI does not immediately account for these changes in consumer behavior, it tends to overstate the true cost of living by assuming consumers continue to purchase the same quantities of goods despite price increases.