Grow or Go Green

Allocate 100 jollies per round across Growth, Green Transition, and Social Spending. Maximize Happiness across 5 rounds. Climate risk and shocks escalate if you under‑invest in Green and Social.

In‑class simulation • 5 rounds • replayable

Round

Current Round

Cumulative Emissions

0.00

Cumulative Development

0.00

Climate Risk

0.00

Shock dynamics (optional)

Shocks depend on risk from past choices

From Rounds 2–5, shock scale rises with Climate Risk (built up from emissions and low adaptation). Prior Growth > Green tilts shocks upward. Social and Green dampen impact.

Emissions → risk (α)

Growth‑tilt weight (β)

Adaptation buffer (γ)

Allocate 100 jollies (integers only)

Growth

Green Transition

Social Spending

Must sum to 100

Current sum: 100

Results

Round	Growth	Green	Social	Emissions	Development	Shock	Happiness
Final Happiness							—

Rules (25/11/10): Round 1 → Dev = 0.10×Growth + 0.02×Green; Em = max(0, 0.015×(Growth − Green)). If Social < 25: Dev −= 0.5. Rounds 2–4 → Dev += 0.09×Growth + 0.04×Green; Em += max(0, 0.015×(Growth − Green))×(1+0.07×(round−1)); Happiness each round = Dev − Em − ShockImpact + 0.012×Social + 0.012×Green, after shock damage is applied to Dev. Final Round 5 → Dev += 0.04×Growth + 0.06×Green; Em += same formula; Happiness = Dev − Em − 3×ShockImpact + 0.01×Social + 0.012×Green, after shock damage. Climate Risk updates every round: Risk += α×Em − γ×(0.6×Green + 0.4×Social), floored at 0 (default α=2.8, γ=0.007). Shock scale (Rounds 2–5): Risk<0.8 ⇒ mild; Risk<2.0 ⇒ moderate; else severe. ShockImpact is a random draw within its band, reduced by adaptation: Impact = Base × RoundMultiplier × (1 − 0.003×Social) × (1 − 0.0025×Green), bounded below at 0.3. RoundMultiplier = [—, —, 1.0, 1.5, 2.0, 4.0]. Growth>Green also nudges shocks upward. Shock damage to the economy (Rounds 2–5): after Impact is realized, Development is reduced by Damage = Impact × DamageMultiplier, with DamageMultiplier = [—, —, 0.5, 0.8, 1.0, 2.0].