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GDP, or Gross Domestic Product, is the total monetary value of all goods and services produced within a country over a specific time period. It serves as an essential measure of a country's economic health, productivity, and overall well-being. There are three main ways of calculating GDP known as the expenditure approach (by demand), the income approach (by what is supplied), and the production approach (also known as the value-added approach). In this exercise, we will focus on comparing GDP as measured by demand and GDP as measured by supply.

GDP measured by demand, also known as the expenditure approach, is calculated by summing up all the expenditures or final uses of goods and services in the economy. There are four main components of this method: 1. Consumption (C): The total spending by households and individuals on goods and services. 2. Investment (I): The spending on capital goods (e.g., machinery, equipment) which will be utilized to produce goods and services in the future. 3. Government spending (G): The total spending by the government on goods and services. 4. Net exports (NX): The difference between exports (goods and services produced domestically and sold abroad) and imports (goods and services produced abroad and purchased domestically). The formula representing GDP by the expenditure approach is: \[GDP = C + I + G + NX\]

GDP measured by supply, also known as the income approach, calculates the total income generated by the production of goods and services within a country. It consists of four major categories of income: 1. Wages and salaries (compensation of employees). 2. Rental income (income generated by land and real estate). 3. Interest income (income generated by financial investments). 4. Profits (corporate profits, proprietor's income, and taxes). The formula representing GDP by the income approach is: \[GDP = Wages + Rental Income + Interest Income + Profits\]

In theory, the GDP measured by demand and GDP measured by supply should be equal, as the total spending on final goods and services (demand) should equal the total income generated by their production (supply). However, in practice, there may be discrepancies due to statistical differences or measurement errors. The demand and supply components of GDP are interconnected and influence each other, and therefore, no significant or consistent gaps between them should exist. To conclude, we should not expect GDP measured by demand to be consistently greater or lesser than GDP measured by supply. Both measurements should ideally produce the same result, but small discrepancies might be present due to statistical and measurement differences.