Once again, simple Keynesian thought-experiments that hinge on saving-investment balances prove to be the best way to think through what is going on at the moment. Macroeconomics is less about supply and demand, more about saving-investment decisions.
Anyway, in thinking about this series for Exante, the following short macro accounting framework was useful.
The General Theorist 
‘Macroeconomics is less about supply and demand, more about saving-investment decisions.’
I’d say there is no ‘less’ or ‘more’ here, S (desired) > I (desired) is trivially synonymous with agg. supply > agg. demand (for ‘goods’ – nonfin. assets – & services):
Since
* S = I + (X-M) – equivalent to ‘change in net worth equals change in real assets plus change in net financial assets’ – is true for any open economy (including any sector or any individual legal subject) and
* (X-M) for the aggregate economy is zero by definition, so that S = I
S (desired) > I (desired) means X (desired) > M (desired): desired sales (supply) > desired purchases (demand). By definition.
In some more detail:
https://blog.anep-economics.org/?p=1421&lang=en
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