Quadratic voting. You can give as many "pushes" to a candidate as you like, but the first costs $1, the second $2, the third $9, the fourth $16... At the end of

Quadratic voting. You can give as many "pushes" to a candidate as you like, but the first costs $1, the second $2, the third $9, the fourth $16... At the end of the game everyone shares in the spoils equally so people get some of their money back.