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Basically, you want a 1 to 1 ratio b/n job seekers and job openings, or you could just eliminate involuntary unemployment by definition by offering a federal Job Guarantee to everybody able and willing to work but unable to find employment in the private sector or 'normal' government.
Yes, it is very hard through the normal process to hit that magic number where the deficit is just right, which is why MMT advocates a 'rules based' Job Guarantee to let the market for unemployed job seekers set the amount of government spending needed to keep us at full employment.
"Crowding out" is only applicable when we're at full output; at that point, additional government spending can be counterproductive as it's competing directly against the non-government for those resources.
But the economy has built-in brakes in the form of the intense incentives to save. This gives the economy a deflationary bias that has to be overcome. These massive demand leakages include pension funds, retirement accounts, corporate reserves, and central bank reserves.
As per fighting inflation, it might be a good idea for government to get in the business of supplying buffer stocks of particular commodities.
Whether we realize it or not, government is a price-setting monopolist at the margins.
It's very important to understand that inflation is not solely caused by too much spending. And even in that case, that private credit creation is by far and away in the ead in terms of adding to overall demand and change in incomes.