Known Unknowns: A Macro-Meso-Micro Socioeconomic Approach to Uncover the Dark Number of Victims of Human Trafficking for the Purpose of Labour Exploitation

When we hear the term human trafficking, many people picture dramatic rescue operations, organised criminal gangs, or victims smuggled across borders. These are well-known forms of trafficking, but one of the most widespread types, labour exploitation, is often hidden in plain sight across greenhouses, warehouses, slaughterhouses, logistics hubs, restaurants, hotels, and domestic households. In everyday life, we may see workers being picked up from known hotspots and transported to work sites. These arrangements frequently operate through temporary contracts, subcontracting chains, false promises, and economic pressures. Because so much takes place informally or clandestinely, human trafficking for labour exploitation is riddled with a dark number, the portion of crime that exists but remains undocumented. We see the tip of the iceberg, in other words.

Recorded crime statistics, therefore, rarely reflect the real scope. Globally, millions of workers suffer in inhumane conditions, as their commodification and commercialisation undermine their dignity and human rights. These conditions include long working hours, withheld wages, threats, an unsafe working environment, and dependency on the employer. In the Netherlands in 2024, only 944  victims of trafficking were officially reported, while an estimated 5000 to 7500 people were trafficked. Most victims remain hidden. The difference between actual and detected cases, the known unknown, is what makes the dark number.

So how do we measure something that hides so well? And how do we prevent vulnerable individuals from becoming invisible?

This blog explores how a macro-meso-micro socioeconomic approach can help uncover this hidden dimension of human trafficking for the purpose of labour exploitation.

How a Macro-Meso-Micro Socioeconomic Approach May Reveal Hidden Exploitation

This is where my PhD research comes in. Labour is the backbone of economic activity, and exploitation at the individual firm level creates distortions that may show up in broader socioeconomic patterns, if the forces of competition within a sector mean that bad actors create a ‘race to the bottom’. A macro-meso-micro approach helps connect the broader forces shaping the economy (macro) with the specific risks within industries (meso) and, ultimately, the lived experience of individual workers (micro).

At the macro level, national statistics such as labour volume, profitability, working hours, hours paid, and labour composition in labour-intensive sectors can serve as early warning indicators. The relationships among these factors indicate sectors in which vulnerabilities may be increasing or where exploitation may be occurring. The meso level focuses on subsectors, recruitment patterns, and supply chain structures. Understanding how industries are organised, for example, subcontracting chains in construction or seasonal hiring in agriculture, helps narrow down where exploitation is most likely concentrated. The micro level focuses on firms and individual workers. Here, the mechanisms of exploitation become visible: withheld wages, threats, unsafe housing, control over movement, and deceptive recruitment practices. These interactions shape a workers daily reality. 

Each level complements the others. Macro indicators identify why certain sectors are vulnerable, meso levels uncover where exploitation may be occurring, and micro-level insights reveal how exploitation actually operates. When combined, these layers create a triangulation method for uncovering dark numbers of potential victims of this crime that would otherwise go unnoticed.

Socioeconomic Implications

The dark figure is not just a missing piece in official crime statistics; it has socioeconomic implications. Since the true prevalence of human trafficking for labour exploitation is unknown, the profit generated largely flows into the shadow economy instead of contributing to the official economy. These illegal profits are often reinvested into criminal networks, reinforcing illegal activities and causing economic losses to the country.

But the human impact is even worse. Every unreported case represents a person whose dignity, freedom, and labour rights have been violated. Children of exploited workers often grow up in unstable, impoverished environments with limited access to healthcare, education, and social mobility. Their vulnerability can extend cycles of exploitation across generations. Additionally, low-skilled migrant workers also face a high risk of homelessness when they lose their jobs, since human traffickers often make housing dependent on employment. Homelessness, in turn, exposes individuals to other forms of crime and increases security concerns within communities.

Seeing the unseen

The recent debate about Minister Paul’s decision to halt the phase-out of the housing deduction is more than a disagreement over labour policy. It illustrates the structural vulnerabilities that allow labour exploitation to flourish. When migrant workers depend on intermediaries for both employment and housing, that dependency becomes a mechanism of control, one that traffickers and unethical agencies exploit.

A macro-meso-micro approach shows that these policies are embedded in larger systems that shape labour markets, recruitment practices, and workers’ everyday lives. When one layer fails, exploitation can spread quietly. That’s why discussions about housing deduction are important. Policies affect visibility, vulnerability, and whether exploitation stays hidden or is exposed. Human trafficking for labour exploitation does not happen in distant shadows; it occurs in gaps between policies, economic systems, and social assumptions. Recognising the known unknowns is not just an analytical task, it is a step towards ensuring that no workers’ dignity depends on silence and that no person remains unseen.