Say’s Law and the failure of Keynesian economics

I am very happy to say that the best paper I have ever written was just yesterday accepted for publication. It’s on John Stuart Mill’s Fourth Proposition on Capital which he published as part of his Principles of Political Economy in 1848. In his own lifetime it was never challenged. Leslie Stephen (who incidentally was Virginia Wolf’s father) described it in 1876 as “the best test of a sound economist”. And yet by 1890 and ever since, although some of the great minds of economics have had a go at it, no one has been able to make straightforward sense of what Mill had meant. And when I say some of the great minds of economics, I am including Alfred Marshall, Friedrich Hayek and Allyn Young.

I should also add that understanding Mill may be amongst the most important issues of our time. Keynesian economic theory, which argues the exact opposite of what Mill had written, has had a devastating effect on every economy in which a Keynesian policy has been applied. Our economies are sinking under the weight of useless public spending and misdirected expenditures under the delusion that such spending will actually do us some good. Mill and every one of his classical contemporaries perfectly well understood that wasteful non-value-adding spending would not only do no good, it would actually do positive harm.

So what was this Fourth Proposition. It may not look all that formidable but in it there lies a truth that may yet save our economies. What Mill wrote was this: “Demand for commodities is not demand for labour.” Or restated using the jargon of today: an increase in aggregate demand will not lead to an increase in employment. The principle stated here is the classical pre-Keynesian meaning of Say’s Law, which has vanished from amongst economists and been replaced by the Keynesian theory which had been specifically designed to refute Say.

For me, the disastrous outcome of the application of Keynesian policies was a certainty. It was beyond any doubt in my mind that the stimulus would not just fail but bring ruin in its wake. I put my views into print in February 2009 just as the stimulus programs were being put into place and my five-year review was published in March this year. In 2009 it was mostly just theory although there had been plenty of Keynesian failures before that. By 2014, the evidence has become so overwhelming that there should no longer be the slightest doubt that a Keynesian stimulus will sink your economy into a coma and leave it that way for years on end. If you want to know why, you can read Mill, or if you find a thousand pages of mid-nineteenth century prose a bit on the heavy duty side, you can read this instead.

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