Not every economic system, economic systems that place significant barriers against ballooning of individual wealth off exploitation see less disparity, and thus less of an impact of money on politics.
You say not every economic system, but then you say less disparity, less impact.
Less disparity means there is still disparity. Less impact means there is still impact.
Because like I said, as long as there are human beings who want more power, there will be a struggle in any economic systems to prevent disparity.
That is because it isn’t the economic system that deregulates or undermines protections.
It is those who seek more power who deregulate and undermine protections.
And those people exist in all types of economic systems.
Even capitalist America had a point in history where disparity was low and the middle class and lower class thrived.
That is no longer the case because of those who removed regulations and changed the laws to suite themselves. And again, those people exist in every type of economy.