Few theorems in economics, or political science in this case, are as disappointing as this one. Another one is Sonnenschein-Mantel-Debreu. https://en.wikipedia

Few theorems in economics, or political science in this case, are as disappointing as this one. Another one is Sonnenschein-Mantel-Debreu. https://en.wikipedia.org/wiki/Sonnenschein%E2%80%93Mantel%E2%80%93Debreu_theorem https://en.wikipedia.org/wiki/Sonnenschein%E2%80%93Mantel%E2... SMD: rational individuals do not sum up to a rational aggregate.