The slope of the price line in a production model is determined by the relative prices of the goods. If the relative price of good T increases, the price line becomes flatter (less steep) relative to the axis representing good T. This change in slope reflects the new market valuation, where the opportunity cost of producing the other good in terms of good T has shifted.

The slope of the price line (or budget line) in a production context is determined by the relative price of the goods. If the Marginal Rate of Transformation (MRT) of good S increases, it means good S has become relatively more expensive compared to the other good. Graphically, this increase in relative price causes the price line to become steeper, reflecting the higher opportunity cost of producing S.

A subsidy effectively lowers the cost of production for firms. This reduction in costs allows producers to offer more goods at every price level, which is represented graphically as a rightward shift of the supply curve. This increases the equilibrium quantity and lowers the price for consumers.

The Marginal Rate of Transformation (MRT) measures the amount of one good that must be sacrificed to produce an additional unit of another good. An MRT of 0.5 indicates that to produce one additional unit of T, the economy must give up 0.5 units of S. This reflects the relative cost of production between the two goods along the production possibility frontier.

Economies of scale occur when a firm's long-run average costs decrease as the scale of production increases. This efficiency gain arises from factors such as specialization of labor, bulk purchasing discounts, and the ability to spread fixed costs over a larger number of units produced. Consequently, the firm achieves a lower cost per unit, which enhances its competitive position in the market.

Internal economies of scale refer to the cost advantages that a firm gains due to an increase in its scale of operations. As the firm expands, it can spread fixed costs over more units and improve efficiency, leading to a reduction in the average cost per unit of production.

Lean production is a systematic approach that integrates the flexibility of craft production with the efficiency of mass production. Its ultimate objective is the elimination of waste to achieve perfection, while simultaneously empowering employees by decentralizing decision-making and pushing responsibility to those closest to the production process.

Specialization allows firms and countries to focus resources on producing goods where they have a comparative advantage. By concentrating production, they can achieve economies of scale, where the average cost per unit decreases as the volume of output increases. This efficiency gain is a fundamental driver of international trade and increased global productivity.

National income, often measured as GDP, is the total value of goods and services produced within a country. Government spending is a key component of aggregate demand. When the government increases its expenditure, it injects money directly into the economy, which stimulates production, creates jobs, and leads to a multiplier effect that increases the overall national income.

In national income accounting, the purchase of a newly constructed residential home is classified as investment rather than consumption. This is because residential housing is considered a capital asset that provides a flow of housing services over many years. Therefore, the construction of new homes is treated as gross private domestic investment in the GDP expenditure accounts, reflecting the creation of new capital stock within the economy.