A note on price futures versus revenue futures contracts

Here we consider the hedging roles of a price futures contract versus a revenue futures contract. In the absence of idiosyncratic output risk, the revenue contract almost always dominates the price contract. Idiosyncratic output risk provides conditions under which the price contract should dominate. When production risk is largely idiosyncratic, a producer with an anticipated long actuals position might combine a long revenue futures position with a short price futures position. © 2004 Wiley Periodicals, Inc. Jrl Fut Mark 24:503–512, 2004     

Symmetry and order in the portfolio allocation problem

Summary. This research studies the role of multivariate distribution structures on random asset returns in determining the optimal allocation vector for an expected utility maximizer. All our conclusions pertain for the set of risk averters. By carefully disturbing symmetry in the distribution of the, possibly covarying, returns, we ascertain the ordinal structure of the optimized allocation vector. Rank order of allocations is also established when a permutation symmetric random vector is mapped into the returns vector through location and scale shifts. It is shown that increased dispersion in the vectors of location and scale parameters benefit, ex-ante, investors as does a decrease in the rank correlation coefficient between the location and scale parameter vectors. Revealed preference comparative static results are identified for the location and scale vectors of asset returns. For most issues addressed, we arrive at much stronger inferences when a safe asset is available. Received: August 8, 2000; revised version: January 8, 2001     

An algebraic theory of multi-product decisions

Summary. We exploit the existence of matrix group symmetries on a production possibility set to identify group symmetries on the profit function. The groups are isomorphic, and provide a pre-ordering on firm preferences over prices. Together with additional structure on the technology, symmetries generate comparative statics on price responses. Linear and other invariances place bounds on firm choice vectors. Reflection group asymmetries on the feasible choice set also support welfare rankings over prices. The methods are adapted to study consumer decisions.Received: 12 August 2002, Revised: 30 January 2004, JEL Classification Numbers: D11, D21, C60, L23. Correspondence to: David A. Hennessy     

Trade and Urbanisation

Insights from economics of geography suggest that greater urbanisation should lead to an increased level of trade. Larger exporting markets should also provide incentives for agglomeration. Using a novel instrumental variables approach, this study provides empirical evidence that suggests that within country urbanisation has a strong positive impact on exports of the modern sector, while exports too have a positive impact on urbanisation. Consistent with model predictions, urbanisation is also associated with a decline in exports and increase in imports in the primary sector.     

Realising the Potential – and Lost Opportunities – for Peer Collaboration in D&T Setting

This paper follows up our theoretical discussion of the potential for collaborative problem solving in Design and Technology (Hennessy and Murphy, 1999). In this paper we report our empirical investigation of peer collaboration in a setting where we identified the presence of significant pre-conditions for productive collaboration. The study investigated the participation of two boys aged 13 who worked together with their teacher over 8 weeks in designing and making an aid for a child with a disability. We analysed their participation using a framework of key features derived from the research literature. Our analyses yielded evidence of effective collaboration in the early design stage, but the students' collaboration and their progress were subsequently undermined. The reasons related to the students' ability to collaborate and the tension for the teacher between students' learning needs and client needs within an authentic activity. The outcome was a successful product but a wealth of lost opportunities – and lack of support – for the students' collaborative problem solving and Design and Technology (D&T) learning. Our observations confirm that despite little evidence of collaboration in D&T, this setting offers extensive resources for supporting collaboration in joint design, planning and problem-solving activities. We also identify impediments to collaboration as a learning mechanism. This revised version was published online in July 2006 with corrections to the Cover Date.     

An algebraic theory of portfolio allocation

Summary. Using group and majorization theory, we explore what can be established about allocation of funds among assets when asymmetries in the returns vector are carefully controlled. The key insight is that preferences over allocations can be partially ordered via majorized convex hulls that have been generated by a permutation group. Group transitivity suffices to ensure complete portfolio diversification. Point-wise stabilizer subgroups admit sectoral separability in fund allocations. We also bound the admissible allocation vector by a set of linear constraints the coefficients of which are determined by group operations on location and scale asymmetries in the rate of returns vector. For a distribution that is symmetric under a reflection group, the linear constraints may be further strengthened whenever there exists an hyperplane that separates convex sets. Received: May 15, 2001; revised version: March 20, 2002 RID="*" ID="*" Journal paper No. J-19797 of the Iowa Agriculture and Home Economics Experiment Station, Ames, Iowa. Project No. 3463, and supported by Hatch Act and State of Iowa funds. Correspondence to: D. A. Hennessy     

Input Decisions and Price-Quality Schedules

Often, a single production process gives rise to a mass distribution of quality levels. If prices vary with quality, then input use is determined by interactions between the production-quality-input use relationship and the price-quality relationship. Using dominance methods, I investigate how price-quality schedules affect optimal input choices. Integral and differential conditions on changes in schedules are found that, together with conditions on the quality-conditioned technology, are sufficient to determine changes in the intensity of input use.     

Industry equilibrium under price distribution and cost shifts

Using a reference utility entry and exit criterion, we consider an equilibrium model of production where market price is random but endogenous with respect to industry output. General conditions are identified for industry output to increase under shifts in costs and in the distribution of demand. Comparative statics of firm level production and firm numbers are also studied. Results confirm the intuition that improvements in cost and demand conditions increase industry production. However, firm level responses are not as intuitive, and depend upon the relationship between the source of disturbance and the compensation through the altered distribution of output price.     

Assessing the Impact of the ‘Decoupling’ Reform of the Common Agricultural Policy on Irish Farmers’ Off‐farm Labour Market Participation Decisions

This paper assesses the impact of the ‘decoupling’ reform of the Common Agricultural Policy on the labour allocation decisions of Irish farmers. The agricultural household decision‐making model provides the conceptual and theoretical framework to examine the interaction between government subsidies and farmers’ time allocation decisions. The relationship postulated is that ‘decoupling’ of agricultural support from production would probably result in a decline in the return to farm labour but it would also lead to an increase in household wealth. The effect of these factors on how farmers allocate their time is tested empirically using labour participation and labour supply models. The models developed are sufficiently general for application elsewhere. The main findings for the Irish situation are that the decoupling of direct payments is likely to increase the probability of farmers participating in the off‐farm employment market and that the amount of time allocated to off‐farm work will increase.