Can ESG data systems improve outcomes without increasing inequality?

Does ESG data inherently favor big companies and worsen inequality?

Yes, a major concern is that ESG data systems have a built-in size bias. A 2023 study found that even after a database provider claimed to have minimized this bias, it was still present: larger companies consistently receive higher ESG scores than smaller ones, simply because they have more resources to report and manage ESG data [5]. This means that when investors use ESG ratings to allocate capital, they may unintentionally funnel more money to already-large firms, leaving smaller companies—and the communities they serve—behind.

This bias has real consequences. A separate study analyzing over 3,300 listed companies worldwide found that ESG ratings significantly boost financial performance for large-scale companies, but the effect is insignificant for small-scale companies [1]. In other words, the very companies that could benefit most from ESG-driven investment—smaller firms—are the ones least likely to see a financial payoff from their ESG efforts, potentially widening the gap between corporate winners and losers.

Can we measure ESG inequality and fix it?

Yes, new tools are emerging to measure and reduce ESG-driven inequality. A 2024 study introduced a method to break down overall inequality into contributions from different dimensions—environmental, social, and governance—and applied it to over 1,000 small and medium-sized enterprises in Italy [3]. The results showed stark sector differences: the manufacturing sector had high financial inequality (Gini coefficient of 0.77, meaning wide variation in financial health) but relatively consistent ESG performance (Gini of 0.19), while the financial sector had the opposite pattern—low financial inequality (0.23) but high ESG inequality (0.26), especially in environmental and social areas [3]. This kind of granular data allows policymakers to target interventions where inequality is worst.

Another study found that over-investment by firms can actually increase inequality in social outcomes, even as it reduces environmental inequality [4]. This suggests that a balanced strategy is crucial: companies that pour too much money into one area may neglect others, creating winners and losers among stakeholders. The authors argue that internal governance and policy should ensure that ESG efforts don't inadvertently prioritize some stakeholder groups over others [4].

What would make ESG systems work for everyone?

To avoid increasing inequality, ESG systems need to be redesigned with equity in mind. One promising approach is to use social identity theory to measure 'social sustainability'—the goal of reducing inequalities and promoting well-being—in a more rigorous, quantifiable way [2]. This could help translate vague sustainability goals into concrete, measurable targets that don't inadvertently favor large firms.

The EU's 2030 New Forest Strategy provides a real-world example of how to handle diversity. A 2025 study found that EU forest policies vary so widely across countries that a one-size-fits-all ESG approach would fail; instead, the researchers identified eight distinct clusters of countries with similar ESG profiles, arguing that differentiated, context-specific policies are needed to achieve common goals without exacerbating inequalities [6]. This principle applies broadly: ESG data systems must account for differences in company size, sector, and regional context to avoid punishing smaller players or less-developed regions.

About These Sources

This answer is built on 6 peer-reviewed studies — published from 2023 to 2025, 3 from 2024 or later, 5 in Q1 journals, collectively cited 681 times — selected as the most relevant from 7 studies that passed quality screening, drawn from 49 papers retrieved from a database of over 500 million.

Sources used in this answer

Related research questions