The irony of the Mundell-Fleming equilibrium model is that it showed that there was no equilibrium possible!  A capitalist economy cannot simultaneously maintain a stable or fixed exchange rate with other currencies, as well as free movement of capital across borders and then expect that monetary policy can be used to control the level of interest rates and the money supply in one economy. Mundell-Fleming found that an economy can only maintain two of the three options at the same time. This principle is frequently called the “Mundell–Flemingtrilemma <https://en.wikipedia.org/wiki/Trilemma>.”

For Marxist economics, this result is no surprise because capitalist economies do not tend to equilibrium as the neoclassical mainstream religiously believes.  Capitalist economies, as they accumulate, tend to disequilibrium because of the anarchy of capitalist competition and the uneven development of capitals seeking profit.  So any attempt to control one aspect of that disequilbrium will only increase disequilbrium elsewhere. If you have a bucket with three holes and only two stoppers, it just leaks faster out of the hole without one.

https://thenextrecession.wordpress.com/2021/04/10/robert-mundell-nothing-optimal/



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