sorrylong

ok basically marxist(and co.) econs tend to treat capitalism as this efficiency maxxing process, this is clearly not the case, marxist descriptions of the mode of production are good but importantly lack the obvious fact that capitalists ultimately prefer control to efficiency.
To deal with this, problem, a lot of ppl just add on epicycles showing that "ackshually they are maximizing efficiency" but these are usually cope.
However, lots of other good comes out of *systemic material analyses* so you don't want to just say "nah marxism all fake" and you need a way to materialistically account for the focus on control.
 Spinoza provides a theory of mind that does this in a ridiculously elegant way. For us humans, increases and decreases in "the power of activity in our body" which is sort of like experienced-agency are the source of all our emotions. Spinoza has a really great and so-obvious-it's-boring chapter about this.
This leads to a systemic way of thinking about humans making irrational decisions that increase their percieved/felt power of activity or agency(this meshes w/ capabilities approach in shape if not actual content)
Spinoza makes rationality mesh by describing rational behavior and emotion as orthogonal to each other. You can't rationality away an emotion, it needs to be countered by another emotion. This is another trivial but genius insight.
So the end point I reach with this all is that:
the theory of mind described by spinoza, that of a human who doesn't see the world perfectly groping for feelings of agency/power and sometimes able to act rationally and other times buffeted about by emotion, is a systemic description of humanity that explains the focus on control over efficiency of capitalism without requiring that the baby of materialist analysis be thrown out with the bathwater