Extended Producer Responsibility: 2D Waste Hierarchy Funnel

Policy Controls

EPR fee rate 0.80 $/kg

Producer eco-design score 0.50

Collection rate 85%

Decision temperature T 0.60

Waste Hierarchy Split

Live Readouts

Landfill diversion

Circularity index

EPR revenue

Items routed

How it works

This is the 2D companion to the 3D Extended Producer Responsibility (EPR) simulator, computed independently rather than a flattened render of the 3D scene: it keeps the exact same multinomial-logit routing physics but draws the waste hierarchy as a side-view funnel instead of a 3D stepped pyramid, and adds genuine pan/zoom navigation the 3D version's orbit camera doesn't expose in the same way.

Each unit of end-of-life product first faces a collection roll: with probability equal to the collection rate it enters the formal system; otherwise it leaks out as uncollected litter. Collected units then choose a route down the waste hierarchy — Reduce, Reuse, Recycle, Recover (energy) or Landfill — using a multinomial logit (discrete choice) model, the same class of model economists use to predict real waste-management behaviour:

effective_cost(i) = base_cost(i) − design·designBonus(i)
                    + fee·feePenalty(i) − fee·subsidyCredit(i)

P(route i) = exp(−cost(i) / T) / Σⱼ exp(−cost(j) / T)

The EPR fee is charged on the routes that externalise the most cost onto the environment (Landfill, Recover) and its revenue funds a subsidy that lowers the effective cost of Reduce, Reuse and Recycle — pushing probability mass up the hierarchy. The eco-design score represents how repairable/recyclable the producer made the product; it directly cuts the base cost of Reuse and Recycle. The temperature T controls how rationally the system behaves: low T sends almost all flow to the cheapest route, high T spreads it out more randomly, modelling imperfect real-world sorting and consumer behaviour.

Landfill diversion — share of collected mass that avoids landfill entirely.
Circularity index — a weighted score (Reduce 1.0, Reuse 0.8, Recycle 0.6, Recover 0.2, Landfill 0) showing how far up the hierarchy the flow sits.
EPR revenue — cumulative fee collected on Landfill + Recover mass, the pool that funds the subsidy.
Drag the funnel to pan, scroll (or pinch) to zoom — a genuinely 2D-native way to inspect any band up close.

Real-world relevance: this logit-routing mechanism mirrors how EU Extended Producer Responsibility schemes and eco-modulated fees (France's éco-contribution, Germany's Verpackungsgesetz) are designed to shift material flow away from disposal without banning it outright.

Drag to pan · scroll to zoom

Reduce Reuse Recycle Recover Landfill

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