The goal of this article is to provide a slightly different spin on economists' use of the positive-normative distinction by providing some context for its use. The major difference is the following: philosophers and philosophically oriented economists, such as Hilary Putnam and John Davis, see the positive-normative distinction in economics as following from the logical positivist position, and they interpret comments made by economists as reflecting scientific methodological positions that have long since been repudiated by philosophers of science. This article (...) argues that economists' use of the positive-normative distinction developed from the Mill–Keynes methodological tradition, which did not hold logical positivist views. Instead, it had pragmatic purposes and was designed to encourage economists to be more modest in their claims for the implications of economic theory. We conclude by arguing that economist's current use of the positive-normative distinction is problematic, as Davis suggests, but th.. (shrink)

Controversies about time discounting loom large in decisions about climate change. Prominently, a particularly controversial debate about time discounting in climate change decision-making has been conducted within climate economics, between the authors of Stern et al. and their critics :977–981, 2006; Weitzman in J Econ Lit XLV:703–724, 2007; Nordhaus in J Econ Lit XLV:686–702, 2007). The article examines the role of values in this debate. Firstly, it is shown that time discounting is a case in which values are key because (...) it is at heart an ethical problem. Secondly, it is argued that time discounting in climate economics is a case of economists making frequent and routine references to ethical values and indeed conduct ethical debates with each other. Thirdly, it is argued that there is evidence for deep and pervasive entanglement between facts and values in the prevalent methodologies for time discounting. Finally, it is argued that this means that economists have given up the ‘value-free ideal’ concerning time discounting, and discussed how the current methodology of time discounting in economics can be improved. (shrink)