When you say 'producing' more you mean a shift in supply right? That's what Say was talking about. If you believe in Says law then you believe that a new equilibrium price will be set after supply increases. There is no movement along the supply curve because the supply curve moves.
The supply curve moves only when the means of production are altered. If you simply create more, it is simply movement along the supply curve. This was driven in by my professors. A shift in the curve usually comes from increases in technology, not by just producing more.
I haven't studied Say much, but it's common belief that he stated that equilibrium price would be maintained no matter how much supply increased, that is that any production of goods would be bought up by consumers.
The basics of Say's law is that demand does not exist without supply. Keynes' said that his argument is 'supply creates its own demand', but this is a misunderstanding of his point. I don't believe that Say would say that under a controlled economy that any production of goods would be bought by consumers. You cannot simply produce something that no one wants and expect it all to be sold. Say knew that.
As far as demand-side Keynesianism, I think it can be used to correct market failure. As far as supply-side economics or trickle down economics I think it doesn't work and causes market failure, and it certainly doesn't correct market failure.
There is the problem again, and what I'm talking about. You consider all demand-side to be Keynesianism and all supply-side to be Reaganism. What about Monetarism? You could consider that supply-side, but it isn't 'Supply-side economics'. That was the whole point. When you say that supply-side has been emphasized throughout economics, you have Reagan in mind, not von Hayek.
Oh, and Monetary policy is much more effective than Fiscal policy, especially in solving recessionary problems.
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