[mathattack]

There's an economics term for this, though I'm spacing on the name. It's the same reason the taxi lobby is so strong - it's a subset of 1 issue voters with concentrated financial support of key issues. It's also behind why tax loopholes are so hard to close - a small subset cares a lot, but the masses less so.

[dredmorbius]

There are several. Smith noted Hobbes's truism: wealth is power. You might be thinking of the logic of collective action, Mancur Olsen.

[mathattack]

Yes - Mancur Olson it is. Thanks! It's more subtle than just Wealth is Power, as it also explains some counterintuitive results.

https://en.wikipedia.org/wiki/The_Logic_of_Collective_Action

[dredmorbius]

Quite. A personal fave.