Sugarscape: Growing Artificial Societies

Sugar Landscape

Amber intensity shows sugar levels. Colored dots are agents — green for wealthy, coral for poor. Agents gravitate toward the two sugar mountains.

Low Sugar

Med Sugar

High Sugar

Rich Agent

Poor Agent

Population Over Time

As agents with high metabolism and low vision starve, the population drops rapidly at first, then stabilizes at the landscape's "carrying capacity."

Gini Coefficient Over Time

The Gini coefficient measures inequality from 0 (perfect equality) to 1 (one agent has everything). Watch how quickly it rises.

Wealth Distribution

The wealth distribution is highly right-skewed — a long tail of wealthy agents and a large mass of poor ones, closely resembling real-world wealth distributions.

Wealth Over Time (Mean & Median)

The growing gap between mean and median wealth is a signature of skewed distribution. When the mean far exceeds the median, a few agents hold most of the sugar.

Beinhocker's Key Insight

In The Origin of Wealth, Beinhocker uses Sugarscape to demolish a common misconception: that inequality requires exploitation, corruption, or unfair institutions. Even in a world of perfectly simple, identical rules — where no agent can cheat, steal, or collude — heterogeneity alone produces inequality. The lesson: inequality is the default emergent state of any system with heterogeneous agents and uneven resources. Reducing it requires deliberate, sustained intervention.

Fun Facts About Sugarscape

> Published in 1996, Sugarscape was one of the first large-scale agent-based models. Epstein and Axtell ran it on hardware with less computing power than a modern smartwatch.
> The "two mountains" landscape was inspired by geographic resource distribution. The agents' migration toward the peaks mirrors real human settlement patterns.
> Adding just two rules — trade and reproduction — produces emergent phenomena including market prices, cultural transmission, warfare, disease epidemics, and economic cycles.
> The Gini coefficient in a standard Sugarscape run typically stabilizes between 0.4 and 0.6, comparable to many real-world economies.
> Epstein later coined the term "generative social science" — if you haven't grown it from simple rules, you haven't fully explained it.
> Natural selection in Sugarscape favors high-vision, low-metabolism agents. Over time, the surviving population's average traits shift — evolution without any genetic algorithm.