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Consumption is an affine function of income, C = a + bY where the slope coefficient b is called the marginal propensity to consume. If any of the components of aggregate demand, a, I p or G rises, for a given level of income, Y, the aggregate demand curve shifts up and the intersection of the AD curve with the 45-degree line shifts right ...
The line at 45 degrees thus represents perfect equality of incomes. The Gini coefficient can then be thought of as the ratio of the area that lies between the line of equality and the Lorenz curve (marked A in the diagram) over the total area under the line of equality (marked A and B in the diagram); i.e., G = A/(A + B).
Its simplest form is the linear consumption function used frequently in simple Keynesian models: [4] C = a + b ⋅ Y d {\displaystyle C=a+b\cdot Y_{d}} where a {\displaystyle a} is the autonomous consumption that is independent of disposable income; in other words, consumption when disposable income is zero.
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In figure 3, the income–consumption curve bends back on itself as with an increase income, the consumer demands more of X 2 and less of X 1. [3] The income–consumption curve in this case is negatively sloped and the income elasticity of demand will be negative. [4] Also the price effect for X 2 is positive, while it is negative for X 1. [3]
The three points R, S, and T in the graph hint different preference combinations. The line connecting these three points is called the income consumption curve (ICC). By extending Panel (a) to Panel (b), the Engel curve for good X is obtained by connecting the points R’, S’, and T’. [3]
Price-consumption curves are constructed by taking the intersection points between a series of indifference curves and their corresponding budget lines as the price of one of the two goods changes. [1] Price-consumption curves are used to connect concepts of utility, indifference curves, and budget lines to supply-demand models. [1]
Budget constraints can be expanded outward or contracted inward through borrowing and lending. By borrowing money in a period, usually at an interest rate r, a consumer can choose to forgo consumption in future periods for extra consumption in the borrowing period. Choosing to borrow would expand the budget constraint in this period and ...