GNP measures the value of final goods and services produced. Financial transactions like loans or gifts are excluded because they do not represent current production. A broker's commission, however, is payment for a service rendered in the current period, and therefore it is included in the national income accounts as part of the service sector's contribution.

The hidden economy, often called the shadow or informal economy, consists of economic activities that are deliberately concealed from public authorities to avoid taxation, social security contributions, or regulatory compliance. Tax evasion is the most significant driver of these unrecorded transactions, as individuals and firms hide income to reduce their tax liabilities, thereby excluding these activities from official GDP calculations.

The provided answer suggests that national income growth decreases tax receipts, which contradicts standard economic theory where higher income typically increases tax revenue. This may be a flawed premise in the source material. In reality, rising national income usually expands the tax base, leading to higher government tax receipts rather than a decrease.

The underground economy, or informal sector, encompasses all economic activities that are not reported to the government for tax or regulatory purposes. This includes both legal activities that are hidden to avoid taxes (such as cash-in-hand work) and inherently illegal activities (such as drug trafficking or smuggling). Because these transactions are not recorded, they are excluded from official national income statistics, leading to an underestimation of total economic activity.

To calculate the growth rate, use the formula: ((New Value - Old Value) / Old Value) * 100. Here, (18,635 - 18,073) / 18,073 = 562 / 18,073, which equals approximately 0.0311. Multiplying by 100 gives a growth rate of approximately 3.1 percent. This metric is essential for understanding the pace of economic improvement relative to population growth.

Value added is the difference between the sale price of a product and the cost of the intermediate inputs used to produce it. This concept is fundamental to calculating GDP using the production approach, as it avoids double-counting of goods.

National income is calculated by aggregating the total income generated by the factors of production—land, labor, capital, and entrepreneurship—within an economy over a specific period. This 'income approach' ensures that the total value of output produced is accounted for by the payments made to those who contributed to that production, providing a consistent measure of the nation's economic activity.

The three methods of measuring national income—the product method (value added), the expenditure method (total spending on final goods), and the income method (total factor earnings)—are theoretically identical. This is because every dollar spent on a final good becomes income for the factors of production that created it, and the value added at each stage of production sums up to the total value of final goods.

The unemployment rate is a key macroeconomic indicator calculated as the number of unemployed persons divided by the total labor force. According to the provided Figure 1, the specific value for the unemployment rate is 5.8%, reflecting the proportion of the labor force actively seeking but unable to find work.

When a consumer purchases an imported good, consumption expenditure increases, but because the good was produced abroad, it must be subtracted from GDP to avoid overstating domestic production. This is handled by an increase in imports, which reduces net exports. Thus, the net effect on GDP is zero, as the increase in consumption is exactly offset by the decrease in net exports, accurately reflecting that the production did not occur domestically.