What mechanism design studies
Mechanism design starts with a social goal and asks what rules, messages, allocations, and incentives could produce useful outcomes when participants act strategically.
Instead of assuming preferences are perfectly observable, it studies how a mechanism asks people to reveal information and what incentives that mechanism creates.
Why incentives matter
A decision rule is both a tally and an incentive system, because it tells participants what kinds of behavior are cheap, expensive, useful, risky, or strategic.
Costs matter because they change the information that participants reveal and the tradeoffs they face when expressing strong preferences.
Where Nicolas fits
Nicolas implements quadratic voting with liquid delegation, quadratic spend, and shifted-softmax outcome probabilities.
It does not claim dominant-strategy truthfulness, VCG-style externality pricing, or universal welfare maximization. Its narrower aim is to make preference intensity costly, inspectable, and usable for real group decisions.