Classical Swine Fever Changes the Way Farmers Value Pigs in South Africa

Although there is growing demand for animal products in Africa, production is stagnating. Appropriate management of livestock diversity could help reinvigorate production, contribute to food security and improve farmers’ livelihoods, particularly in subsistence‐oriented systems. We assess differences in farmers’ preferences and economic values for pig traits across different production systems and across areas that have been affected and unaffected by classical swine fever (CSF). Not surprisingly, market‐oriented farmers derived higher values from the productive traits such as heavy slaughter weight and large litter size found in exotic pig genotypes. Subsistence‐oriented farmers, particularly in swine fever affected areas, placed high value on tolerance to disease. We found that CSF changed farmers’ preferences for adaptive traits, and less so for productive traits. Therefore, indigenous breeds become more valuable for subsistence farmers and crossbreeds for market‐oriented farmers if CSF is a risk. Our results can have implications for breeding and conservation strategies and for compensation strategies after culling, and will become increasingly relevant if, as predicted, heat waves and disease outbreaks become more frequent in pig production systems in South Africa with climate change.     

Teaching Net Present Value Analysis: Returns-to-Assets versus Returns-to-Equity

We survey textbooks from agricultural economics and other subject matter areas to determine their treatments of the returns-to-assets versus returns-to-equity methods for determining the net present value of investment projects. Textbook authors disagree about the appropriate method, often give conflicting advice as to how a given method should be applied, and do not show how the results of the two methods can be reconciled. We provide a consolidated discussion of the circumstances under which the two methods produce the same net present value.     

Hayek and liberal pedagogy

The author employs Hayek’s concepts of knowledge and spontaneous order to outline a learning-centered alternative to teacher- and student-centered pedagogies. In a Hayekian classroom, learning (intellectual order) emerges from a polycentric web of instruction, study, conversation, frustration, and discovery that continually elicits and tests the knowledge claims of students and teachers. Yet, unlike Hayek’s impersonal market process, the process of liberal learning is both personal and impersonal. To capture this hybridity, the author supplements Hayek’s insights with those of Parker Palmer, a liberal educator whose analysis of the classroom as a community of truth is attuned to the interpersonal dimensions of knowing and learning.     

Where are the best opportunities for reducing greenhouse gas emissions in the food system (including the food chain)?

This paper reviews estimates of food related greenhouse gas (GHG) emissions at the global, regional and national levels, highlighting both GHG-intensive stages in the food chain, and GHG-intensive food types. It examines approaches that have been proposed for mitigating emissions at each stage in the chain and looks at how these sit within wider discussions of sustainability. It finds that efficiency-focused technological measures, while important, may not only be insufficient in reducing GHGs to the level required but may also give rise to other environmental and ethical concerns. It gives evidence showing that in addition to technological mitigation it will also be necessary to shift patterns of consumption, and in particular away from diets rich in GHG-intensive meat and dairy foods. This will be necessary not just in the developed but also, in the longer term, in the developing world. This move, while potentially beneficial for food secure, wealthier populations, raises potentially serious nutritional questions for the world’s poorest. A priority for decision makers is to develop policies that explicitly seek to integrate agricultural, environmental and nutritional objectives.     

Teaching the coase theorem: Are we getting it right?

The authors examine current textbook representations of Coase's analysis of negative externalities [Coase, 1960]. Standard treatments identify Coase's ideas with Stigler's Coase Theorem: a zero transaction cost world in which efficient solutions emerge automatically, regardless of legal rules and the initial allocation of rights. Yet Coase's seminal paper breaks from this mode of analysis. The authors use this intellectual history to distinguish two approaches to negative externalities: blackboard (Pigou, Stigler, Samuelson) and Coasean. They survey 45 microeconomics textbooks and find that 80 percent misrepresent Coase's arguments. They argue that a Coasean approach increases students' critical thinking skills by challenging them to move beyond simple laissez faire or interventionist solutions.     

The Entry and Exit Dynamics of Self-Employment in Canada

This paper documents the extent and cyclicality of self-employment entry and exit flows; explores transitions to and from self-employment; and investigates the influence of individual characteristics and labor market experience as well as macroeconomic conditions on the probability of moving into or out of self-employment.The self-employed sector now employs over two and a half million Canadian workers, has expanded on average by over 4% in the 1990s and accounted for over three out of every four new jobs the economy has created. There are substantial flows both into and out of self-employment over the last 15 years. Gross flows into and out of self-employment averaged nearly half a million per year between 1982 and 1994, amounting to 42% of the total self-employed population.Regression results reveal no statistical evidence supporting the dominance of the push hypothesis over the pull hypothesis – the notion that people are increasingly pushed into self-employment by deteriorating economic conditions. This analysis is done both through time-series analysis and the analysis of the determinants of flows into (and out of) self-employment. As in paid employment, younger Canadians are subject to higher turnover in self-employment – they are not only more likely to enter but also substantially more likely to leave self-employment. Prior paid-employment experience and prior self-employment experience are both found to be associated with a higher likelihood of entering self-employment. The longer one is self-employed, the less likely he/she is going to leave the business. Having a spouse in business (being self-employed) substantially increases the likelihood of the other spouse becoming self-employed – a self-employed spouse often attracts the other to either join the family business or start their own. We also find evidence that steady family income through paid-employment from one spouse increases the self-employed's (the other spouse's) affordability to continue with the business venture and hence reduces the likelihood of leaving self-employment.     

Job Creation by Company Size Class: The Magnitude,Concentration and Persistence of Job Gains and Losses in Canada

The statistical observation that small firms have created the majority of new jobs during the 1980s has had a tremendous influence on public policy. Governments have looked to the small firm sector for employment growth, and have promoted policies to augment this expansion. However, recent research in the U.S. suggests that net job creation in the manufacturing small firm sector may have been overestimated, relative to that in large firms.The first part of this paper addresses various measurement issues raised in the recent research, reassess the issue of job creation by firm size, and pushes this work beyond the manufacturing sector by employing longitudinal data covering all companies in the Canadian economy. We conclude that over the 1978–92 period, as a group small firms did account for a disproportionate share of both gross job gains and losses, and net employment increases, no matter which method of sizing firms is used. Measurement does matter, however, as the magnitude of the difference in the growth rates between small and large firms is very sensitive to the measurement approaches used. Part one of the paper also produces results for various industrial sectors, and examines employment growth in existing small and large firms (i.e., excluding births). It is found that employment growth in the population of existing small and large firms is very similar. Attempts are made to introduce a job quality aspect to the analysis by using payroll rather than employment data. Payroll data allow any relative change in hours worked or wages paid in small (relative to large) companies to be incorporated in the findings. This did not significantly alter the conclusions reached using employment data only.The second part of the paper looks at concentration and persistence of employment creation and destruction within size classes. If growth is highly concentrated, knowing that a firm is small will provide little information about its prospects for growth. Most small firms would grow relatively little, or decline, while a few expanded a lot. It is found that both job creation and destruction is highly concentrated among relatively few firms in all size groups. There are fast growing firms in all size classes, and although most job creation is found in the small firm sector, the fastest growing large firms out-perform the majority of small firms in any given period. Finally, the employment creation performance of businesses are compared over two three-year periods. It is found that knowing that a firm is a high performer (in terms of jobs created) over one period is of only limited value in determining growth in the second period. This is particularly true among small firms. These results suggest that firms which expand rapidly during one period are replaced to some considerable degree by others in the subsequent period.