Abstract
Alfred Marshall’s introduction of the “Giffen paradox” has kept the minds of many economists occupied for more than a century, as has the more general issue of the possibility of an upward sloping segment of the demand curve. In this paper, I will briefly discuss the main historical roots of this literature and investigate a number of explanations of a positively sloping demand curve.
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Notes
- 1.
This point is not mentioned by Hicks and Allen [20], but may be seen as follows. Suppose two goods X and Y with quantities x and y and a suitable utility function u(x, y). The marginal rate of substitution of X for Y (MRS) equals u x ∕ u y (subscripts denote partial derivatives). Differentiating with respect to y gives (u y u xy − u x u yy ) ∕ u y 2. Now, with income m, and after some manipulations, differentiation of the first-order conditions of constrained utility maximization gives: ∂x ∕ ∂m = λ(u y u xy − u x u yy ) ∕ Ω, where λ is the positive marginal utility of money and Ω is the Hessian determinant of u bordered by (0, u x , u y ), which also is positive in the case of convex indifference curves. Hence, sign(∂x ∕ ∂m) = sign(∂MRS ∕ ∂y). Note that under additive utility, u xy = 0, therefore, sign(∂x ∕ ∂m) = sign( − u yy ) (see below).
- 2.
- 3.
See footnote 1 for notation; “budget” refers to a consumer’s optimum goods bundle; and “(un)stable” refers to whether the second-order condition is satisfied. See also [1, p. 26].
- 4.
- 5.
See footnote 1.
- 6.
The example of Wold and Juréen is based on [52]. It is reproduced as an exercise by Katzner [24, p. 62] and more recently discussed by Weber [49]. There are surprisingly few publications with specific utility functions that imply Giffen behaviour, see e.g. Vandermeulen [47], Silberberg and Walker [39], Spiegel [42], Sörensen [41], Doi et al. [13], and Haagsma [18].
- 7.
Since the marginal rate of substitution of X for Y is positive, the indifference curves slope downward. The rate of change of their slope is d 2 y ∕ dx 2 = (2 − y) ∕ 4(x − 1)2 > 0, so the indifference curves also are strictly convex.
- 8.
The slope of the demand for Y is determined by sign(p x − m), which is negative by the right-hand inequality constraint.
- 9.
- 10.
See, e.g., Dwyer and Lindsay [14], Kohli [25], Berg [4], McDonough and Eisenhauer [31], and Rosen [37]. Dwyer and Lindsay make the logical point that, instead of increased, aggregate consumption of potatoes must have decreased, since there were fewer potatoes available for the Irish people. In 1845 about one half of the crop was destroyed and in 1846 about 90%. Less clear is what happened with potato prices, though Dwyer and Lindsay argue that prices probably increased.
- 11.
Rosen [37] incorporates these two equations into a larger dynamic model, which he uses to investigate the effects of a transitory and a permanent decline in the productivity of seed potatoes.
- 12.
- 13.
Nachbar assumes that individuals have only preferences over commodities, not over factors endowments.
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The author thanks the editors of this book and Hans-Peter Weikard for their helpful comments on an earlier draft of the article.
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Haagsma, R. (2012). Notes on Some Theories of Giffen Behaviour. In: Heijman, W., von Mouche, P. (eds) New Insights into the Theory of Giffen Goods. Lecture Notes in Economics and Mathematical Systems, vol 655. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-21777-7_2
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