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Evaluating Friedman's Instrumentalism

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Introduction
Since the 2008 financial crisis, economists have been blamed for their incapability to predict the collapse of the financial system with economic models. It has been widely debated about the role of economic models, in particular their underlying assumptions and their ability to predict the upcoming events. Colander et al pointed out that unrealistic assumptions plays a main role in the failure of economic models (Colander et al 2009: 7-10). Opponents would invariably point their fingers towards Friedman’s ‘Methodology of Positive Economics’; where he proposed that the validity of assumptions is totally irrelevant when evaluating economic models, only the usefulness of prediction matters.
Nonetheless, when evaluating economic models, we should take into account the description, explanation and understanding of the world. In this essay, by using the Ricardian model as an example, I will illustrate that even if one only cares about the prediction, we should also address the importance of assumptions, which would then lead us to explore the true purpose of science.

The Ricardian Model
The Ricardian trade model is a simple yet powerful theory that refutes common fallacies about the causations of trade flows. It illustrates that, instead of absolute advantage, it is comparative advantage that brings forth the gains from trade. Comparative advantage refers to the ability to produce a product at a lower opportunity cost than another. This ability is the result of

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