I've just read a paper called A pluralist approach to microeconomics from the book The Handbook of Pluralist Economics Education. I read it because I make pin money supervising undergraduates for the compulsory microeconomics classes in first and second year. Like most supervisors, the courses I teach have almost nothing to do with my research. Also like many economics supervisors, I believe that a lot of what I teach is complete bollocks, with either no applicability to the real world or completely misleading conclusions. When I started I didn't mind so much. I figured out quite quickly that I should really view the undergraduate course as some very long in depth transferable skills course. Economics graduates are very employable, not because they have any particular knowledge about how the economy works, but because it's one of the few degrees which combines some quite advanced mathematical and statistical skills with written communication. Economics degrees also value a particular kind of brightness, which can be useful in some jobs. I was happy with all this until the financial crisis increasingly made me worry that a part of the problem might be that we'd been sending out economics graduates armed with nonsense ideas of the economy for decades. I started to feel complicit. Now, I still recognise that I'm being paid t get them their highest grade possible in their exams. It would be unfair to them not to do that and I remember as an undergraduate getting frustrated with supervisors thinking "Yes, I know this model is nonsense but I need to understand it to get through the exam". Still I wanted to slip in a bit if dissent, some things which, if they have the inclination, they can follow up in their own time to give a different picture of the world. Something to make them feel a little uneasy about smug pronouncements about efficiency. So I'm making notes on useful things to bring up in supervisions. I thought I'd put them here so anyone else interested can see them.
Perfect competition
Keen did a computer simulation to show that Friedman's claim that however firms actually chose how much to produce, the competitive process would ensure that they produced where price was equal to marginal cost. In the simulation with 10,000 firms he found that they actually the competitive market produced the same as the monopolist if all of the firms followed a simple strategy of randomly increasing or decreasing quantity supplied a bit and then keeping going in the same direction if it increased their profits. The reason for this result was found in Stigler (1957) "Perfect Competition, Historically Contemplated" in which he showed through simple chain rule that the demand curve faced by a competitive firm is not horizontal but rather the market demand curve. Keen provides an appendix on how to calculate the true profit maximising choices by competitive firms not acting strategically.
Market Demand curve
The assumption that the aggregate market demand curve is downward sloping like individual demand curves requires the assumption that an extra unit of purchasing power would be spent the same way no matter to whom it was given. This would require both a) that all Engels curves were straight lines and b) that all consumers had parallel Engels curves. If either of these assumptions do not hold (as they don't) well behaved preferences and individual demand curves can result in non-downward sloping market demand curves because price also influences the income distribution of consumers.
He then suggests a game to raise questions about the capitalist system and models. He talks about the importance and availability of data on firms. Firm size in the US has a scale free distribution. Only 11% of US GDP is produced in conditions of rising marginal cost (Blinder et al 1998). Most firms are price setters. Most sales are for 'intermediate goods'. 85% of sales are to existing customers. Most firms operate at roughly constant average cost.
Revealed Preference
Sippel 1997 "Experiments on the Pure Theory of Consumer Behaviour" found that even in a relatively simple set up SARP was violated by over 75% of participants and GARP by more than 50%.
He suggests Schumpeterian analysis of competition and Kalecki and Sraffian analysis of price setting as alternative approaches to microeconomic issues which could be discussed.
Game Theory
Points out that if duopolists do not know each other's cost structure and choose quantities by trial and error they may end up in cooperative outcome.
Perfect competition
Keen did a computer simulation to show that Friedman's claim that however firms actually chose how much to produce, the competitive process would ensure that they produced where price was equal to marginal cost. In the simulation with 10,000 firms he found that they actually the competitive market produced the same as the monopolist if all of the firms followed a simple strategy of randomly increasing or decreasing quantity supplied a bit and then keeping going in the same direction if it increased their profits. The reason for this result was found in Stigler (1957) "Perfect Competition, Historically Contemplated" in which he showed through simple chain rule that the demand curve faced by a competitive firm is not horizontal but rather the market demand curve. Keen provides an appendix on how to calculate the true profit maximising choices by competitive firms not acting strategically.
Market Demand curve
The assumption that the aggregate market demand curve is downward sloping like individual demand curves requires the assumption that an extra unit of purchasing power would be spent the same way no matter to whom it was given. This would require both a) that all Engels curves were straight lines and b) that all consumers had parallel Engels curves. If either of these assumptions do not hold (as they don't) well behaved preferences and individual demand curves can result in non-downward sloping market demand curves because price also influences the income distribution of consumers.
He then suggests a game to raise questions about the capitalist system and models. He talks about the importance and availability of data on firms. Firm size in the US has a scale free distribution. Only 11% of US GDP is produced in conditions of rising marginal cost (Blinder et al 1998). Most firms are price setters. Most sales are for 'intermediate goods'. 85% of sales are to existing customers. Most firms operate at roughly constant average cost.
Revealed Preference
Sippel 1997 "Experiments on the Pure Theory of Consumer Behaviour" found that even in a relatively simple set up SARP was violated by over 75% of participants and GARP by more than 50%.
He suggests Schumpeterian analysis of competition and Kalecki and Sraffian analysis of price setting as alternative approaches to microeconomic issues which could be discussed.
Game Theory
Points out that if duopolists do not know each other's cost structure and choose quantities by trial and error they may end up in cooperative outcome.