I make the point for a simple reason. There could be a relationship between I and S. But you have to make assumptions to make that relationship. And the fact is that if, as has been the case of late the savings ratio has been small or even negative, then investment can be financed by the government, or by government-created money or by overseas interests (to relax that condition, once more). In other words, there is nothing that says there is an immutable relationship between S and I. There is just a funding mix and it is my suggestion that the relationship is weak at best, and that other factors can be and almost certainly are more powerful, and that can and should now include government-created money to be used for this purpose.
And, of course, manages to miss the point. Savings are production in this period which are not consumed in this period, instead allocated to be consumed in a future one. Investment is the allocation of production not to be consumed in this period but to be so in a future one.
There’s a link between those two whatever MMT has to say on the subject.