"Multivariate analysis indicates that economic elites and organised groups representing business interests have substantial independent impacts on US government policy, while average citizens and mass-based interest groups have little or no independent influence."
And have you seen any discussion of who exactly ends up as CEO of say fortune 500 companies. There is a distinct lack of women, and of the women who are represented there is a slant to those with wealthy family backgrounds.
Here’s some job ads for CEO: https://www.indeed.com/m/jobs?q=CEO
You’ll notice there’s nothing about gender in any of them, or being born to wealthy parents.
Consider that maybe the limiting factor to becoming a CEO is yourself, and not society, men, rich people, discrimination, etc.
In other words, vote buying is not necessarily why votes correlate with contributions along policy lines.
Fact: You can be a CEO.
Fact: You can be elected to vote on laws.
Fact: There is no financial or divine right requirement to run for office or be a CEO.
[1] https://www.ifs.org/wp-content/uploads/2012/11/Bronars-1997-...