Ancient Mohenjo-daro Reveals Decrease in Economic Inequality Over Time

Examining 309 housing units in Mohenjo-daro, researchers discovered that disparities in home size diminished during the city’s Bronze Age progression, challenging the common belief that urban growth in ancient times led to rising economic inequality.

Published on May 18, 2026, in Antiquity, the study used dwelling size as a proxy for wealth levels. In a city sector where construction phases could be chronologically identified, inequality indicators dropped from roughly 0.39 near 2500 BC to 0.23 by 2100 BC.

Mohenjo-daro was a major urban center of the Indus Civilization, which thrived in South Asia between approximately 2600 and 1900 BC. The archaeological site is located in present-day Sindh, Pakistan.

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The investigation was conducted by Adam S. Green from the University of York, alongside Iqtedar Alam and Cameron Petrie from the University of Cambridge. A University of York news release highlighted that the results suggest Mohenjo-daro’s prosperity coincided with reduced economic gaps.

Home Dimensions Grew More Uniform with Time

The team developed a geographic database utilizing historical excavation records, translating housing blueprints into quantifiable areas. They calculated Gini coefficients across different sectors and periods of the city’s history.

The Gini coefficient, which ranges from zero (perfect equality) to one (maximum inequality), is used by archaeologists to estimate wealth disparities through house size, though the study notes this metric does not capture all aspects of social inequality.

For the entire site, Mohenjo-daro’s residential Gini was 0.44, notably lower than figures for other ancient cities like Knossos at 0.86 and Palenque at 0.75. Contemporary West Asian cities such as Ur and Ugarit recorded values exceeding 0.6.

Despite this, the researchers advise caution against labeling Mohenjo-daro’s overall inequality level as highly egalitarian, as even some Neolithic settlements considered relatively equal feature Gini coefficients near 0.2 or less.

The most definitive trends stemmed from DK-G South, where excavation details allowed temporal sequencing of residences. Early large dwellings dated to about 2500 BC showed a Gini of 0.39, which decreased to 0.23 by roughly 2100 BC.

The median house size initially was 161.39 square meters, dipped to 98.02 square meters around 2200 BC, then rose again to 141.13 square meters concurrent with the lower Gini coefficient. The paper notes the link between increased productivity and lower inequality is not statistically strong, due to sparse data points.

Urban Planning and Infrastructure Expanded as Inequality Fell

The reduction in residential disparities paralleled urban development changes, with homes becoming more standardized and aligning closely with the street grid. Archaeological evidence also reveals planned streets, drainage networks, and shared civic utilities emerging over time.

The authors propose that administrative systems might have influenced this pattern. As residential inequality lessened, more buildings followed established street layouts, though the study acknowledges this association does not prove causation.

Unlike many ancient cities with prominent elite structures, Mohenjo-daro and other Indus centers lacked grand palaces, monumental tombs, exclusive temples, or art celebrating rulers—markers typically indicating centralized power.

Instead, the city featured organized streets and sewage systems, as well as standardized weights and measures for trade. Small stone seals, likely used in commercial exchanges, were mostly found inside residences rather than in temples or palaces. The researchers suggest these systems may have curtailed resource monopolization, though the specifics of Mohenjo-daro’s governance remain unclear.

Limitations Due to Early Excavation Documentation

This analysis relies heavily on records from initial archaeological digs. The authors highlight that the city's complex architecture was not always documented precisely by early 20th-century methods, limiting chronological clarity.

While DK-G South allowed separation of different construction phases, other site areas contain layers from multiple periods intertwined. Hence, it can only be inferred that the decline in inequality observed in DK-G South was representative across the city.

Using home size as a stand-in for wealth has limitations. Wealthier residents did not always own larger houses, and factors such as gender, family ties, or ethnic distinctions are not represented by dwelling area. The study also warns that residence size only indirectly gauges economic productivity.

Overall, the research finds that Mohenjo-daro experienced lower economic inequality than many similar ancient urban centers, with inequality lessening as the city matured and developed along its paved streets. Future studies could expand this work by dating buildings in other areas and integrating additional indicators of social wellbeing and disparity.

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