As ads are made to encourage people to vote, and some people are more or less concerned about voting, each addition ad dollar has a lower effect.
A hypothetical $10m in ads could get 85% of x voters, and $8m could get 70%, but $2m would get 50% and $0m would get 25%, so the 8:10m in funding would be preferential to the 0:2m.
At some point this incentive mechanism would stop working because a party receiving 0 vs a party receiving non-zero would benefit more from having money at the margin.
As ads are made to encourage people to vote, and some people are more or less concerned about voting, each addition ad dollar has a lower effect.
A hypothetical $10m in ads could get 85% of x voters, and $8m could get 70%, but $2m would get 50% and $0m would get 25%, so the 8:10m in funding would be preferential to the 0:2m.
ah, yeah, that’s what I was referring to with: