Microfoundations

History The microfoundations project originated in the post-Second World War neoclassical synthesis where it is generally believed that neoclassical microeconomics fused with Keynesian macroeconomics. The 'neoclassical microeconomics' in mention is the Marshallian partial-equilibrium approach, which emerged from the Walrasian general equilibrium theory. and macroeconomists have also studied alternative microeconomic models (such as models of credit market imperfections and precautionary saving) that might imply a greater marginal propensity to consume. One particularly influential endorsement of the study of microfoundations was Robert Lucas, Jr.'s critique of traditional macroeconometric forecasting models. After the apparent shift of the Phillips curve relationship during the 1970s, Lucas argued that the correlations between aggregate variables observed in macroeconomic data would tend to change whenever macroeconomic policy changed. This implied that microfounded models are more appropriate for predicting the effect of policy changes, using the assumption that changes of macroeconomic policy do not alter the microeconomics of the macroeconomy. In terms of solutions, dynamic stochastic general equilibrium (DSGE) modelling with representative agents has been the most prevalent among literatures. This approach "makes the microeconomic and the macroeconomic level of analysis coincide: a single agent, a utility maximizing individual, represents an entire sector, which may be, for instance banks, consumers, or firms". Therefore, DSGE modelling connects both microeconomic and macroeconomic theories, thus embodying the basis of microfoundations. Importance It is suggested that modern mainstream economics is based entirely on DSGE models. The Smets-Wouters model is one example of the importance of microfoundations as it is regarded as a benchmark model for analysing monetary and fiscal policy. The model offers three main advantages of microfoundations: • Microfoundations provides a modelling structure where data may not be very informative. • Microfoundations avoids the Lucas Critique as it is able to relate the reduced-form parameters to deeper structural parameters. • Microfoundations provides a basis for estimating the optimality and desirability of policy. While these points summarise the desire to adopt DSGE models - or microfoundations - there are limitations to the model with scholars stating that their forecast performance can be poor in terms of their ability to forecast individual variables. Therefore, there is continuous debate on the microfoundations project and its efficacy with an overall lack of consensus. == Microfoundations research and development ==

"Micro" and "macro" research Specialization in the management and organizational sciences has led to a divide between "macro" and "micro" areas. Research in macro management mainly focuses on the organizational or firm level, while research in micro areas mainly examines individual and group levels within organizations. For example, macro research domains typically include strategic management and organization theory, whereas micro includes areas such as organizational behaviour and human resource management. There, bridging these two domains continues to be a topic of debate for organizational, management and strategy scholars. Therefore, microfoundations research focuses on the influences of individual actions and interactions on firm heterogeneity. Thus, the specific level of the microfoundations project is the individual level as it focuses on this elementary truth. However, there are various assumptions and half-truths that have been explored by scholars within microfoundations research. Assumptions There are two main assumptions that the microfoundations project rests upon: • Firstly, it is possible to establish empirically adequate theory of individual behaviour. • Secondly, the theory can be transformed into a theory of the economy using aggregation procedures, without having to make any substantive assumptions about the economy. However, in addition to these assumptions, various scholars have indicated that microfoundations is understood to be "an application of underlying standpoint, methodological individualism," a concept which also has ambiguity in its meaning. Nevertheless, microfoundations research only means that individual behaviour must be shown to be consistent with macro entities. While there may be various outlooks on the topic, the general consensus implies that to bridge macro and micro theories and models, microfoundations should be adopted. ==Challenges==

Alan Kirman has argued against the common practice of using a representative agent as micro-foundation for macroeconomic models. First, he suggests that there's a conviction that the model of an individual as a constrained maximiser is adequate. On the basis of the Sonnenschein–Mantel–Debreu theorem, he argues that this conviction is mistaken. Second, he argues that there are multiple reasons as to why the economy cannot be described by a single 'representative agent'. Thus, he suggests that proper micro-foundations should be based not on studies of individuals in isolation but on studies of aggregate activity resulting from the direct interaction between different individuals. Similarly to Kirman, Robert Solow has argued that the issue with the microfoundation project is the demand that it must be built on Walrasian foundations. According to him, there is however no reason to believe that the world (and thus our microfoundations) should be Walrasian. Although sympathetic to microfoundations overall, Solow points out that the demand for micro-foundations might be exaggerated; the harder sciences do not necessarily describe their objects of interest down to e.g. a molecular level. S. Abu Turab Rizvi has similarly offered critique against the microfoundation project in general equilibrium theory. ==See also==