I subscribe to the Chicago school way of thinking way more than Marx or Keynesian economics, but I totally disagree. Everything about economics can be wrong. You can't control for every variable in a market. It just isn't possible. Even economic "laws" like supply and demand have counter examples like Giffen goods.
Counter examples only show that something does not work in all cases. It isn't a proof that something doesn't work in any case. Supply and demand is going to hold true in the vast majority of cases despite the existence of counter examples. In a similar vein, you can't say that an economic model is invalid in all cases because there are counter examples.
There are a ton of external factors that lead to the success or failure of a market. Culture, politics, resources, and industrialization play a huge role in shaping the market. These things are ever changing. Argue against the model, not its success or failure.
Counter examples only show that something does not work in all cases. It isn't a proof that something doesn't work in any case. Supply and demand is going to hold true in the vast majority of cases despite the existence of counter examples. In a similar vein, you can't say that an economic model is invalid in all cases because there are counter examples.
There are a ton of external factors that lead to the success or failure of a market. Culture, politics, resources, and industrialization play a huge role in shaping the market. These things are ever changing. Argue against the model, not its success or failure.