Beyond the Obvious: Other Job and Employer Heterogeneities Affecting Pay

When you get a job offer, what’s the first thing you look at? For most of us, it’s the salary. We tend to think that our pay is a direct reflection of our skills, our experience, and our education. We believe that if two people have the same qualifications and do the same job, their paychecks should be identical. But what if they aren’t? What if one person earns significantly more, not because of what *they* do, but because of *where* they work? In economics, this idea is called employer heterogeneity, a fancy term for a simple truth: all employers are different. These differences-in size, in policy, and even in their biases-can create massive gaps in pay for a very similar job.

While we often focus on a worker’s ‘human capital’ (their skills and knowledge), the characteristics of the employer or the job itself are just as powerful. We’re not just talking about obvious things like working in a high-paying industry versus a low-paying one. Even *within* the same industry, two firms sitting side-by-side can have wildly different pay scales. This post explores three of these powerful, and often hidden, heterogeneities: the size of the firm, the presence of a union, and the unfortunate reality of discriminatory tendencies.

The firm-size puzzle: Why going big often means getting paid more 🔗

Imagine two software developers, Priya and Rahul. Both have five years of experience and similar skills. Priya works for a 15-person tech startup. Rahul works for a multinational IT giant with 100,000 employees. Even if they have the exact same job title and responsibilities, chances are high that Rahul earns a significantly higher salary. This isn’t a coincidence; it’s one of the most well-documented facts in labor economics, known as the employer-size wage effect.

For decades, economists have observed that large firms consistently pay their workers more than small firms, even after accounting for factors like industry, region, and worker experience. The question is, why? It’s not just one single reason, but a combination of powerful forces.

What’s really behind the size premium? 🔗

If you ask an employer why they pay what they do, they won’t just say “because we’re big.” The size is a proxy for other underlying characteristics that give large firms both the ability and the incentive to offer higher wages.

• A simple ability to pay: Larger firms often enjoy economies of scale, greater market power, and higher profitability. They are simply more profitable and can afford to share those profits with their employees. A study of India’s manufacturing sector, for instance, found that firm size, age, and profit margins are key explainers for wage differences.
• Sorting and better talent: Large firms have complex operations and the stakes are high. They need to hire the most productive and reliable workers they can find. Because they have a large applicant pool and sophisticated HR departments, they can “sort” through candidates and select the best. To attract and retain this top-tier talent, they must offer premium pay.
• The ‘efficiency wage’ theory: This is a fascinating concept. Some firms intentionally pay *above* the market-clearing wage. Why would they “overpay”? Because it pays for itself. A higher wage can boost morale, improve loyalty, reduce costly employee turnover, and motivate workers to put in their best effort. It also discourages ‘shirking’ (slacking off) because if you get fired, you lose a high-paying job, not just an average one. Large firms, where monitoring individual employees can be difficult, often find this strategy very effective.
• Strategic union avoidance: In some industries, large non-union firms will intentionally pay wages that are equal to or even *higher* than their unionized competitors. This isn’t generosity; it’s a cold, calculated strategy. By paying more, they give their employees very little incentive to vote for a union, thus avoiding the collective bargaining process and maintaining full managerial control.

So, when Priya compares her paycheck to Rahul’s, the difference isn’t just about her skills. It’s about her startup’s cash flow versus Rahul’s company’s global profits, market position, and HR strategy.

The power of a group: Union status and the wage premium 🔗

Another major difference between employers is whether their workforce is unionized. An individual employee, on their own, has very little bargaining power. If you go to your boss and demand a 20% raise, they might just wish you luck in your future endeavors. But if all 500 employees on the factory floor stop working and demand a 20% raise *together*, suddenly management is willing to sit down and negotiate. This is the core principle of a trade union.

This collective power translates directly into paychecks, creating what economists call the union wage premium. This is the measurable, often substantial, percentage by which a union member’s earnings exceed those of a comparable non-union worker.

How do unions secure higher wages? 🔗

The impact of unions on wages is profound. In India, for example, studies have shown significant pay gaps between union and non-union workers. One analysis of the organized manufacturing sector found that the wage premium for permanent union workers could be over 50% compared to their non-union counterparts. This premium doesn’t just appear out of thin air; it’s the result of specific union activities.

Collective bargaining and rent-sharing: Unions function through collective bargaining. They negotiate a binding contract with the employer that sets out wages, benefits, and working conditions for a set period. In these negotiations, unions are essentially fighting for a larger slice of the company’s economic “rent”-a term for profits that are above and beyond what is minimally necessary to keep the business running. Studies from institutions like the National Bureau of Economic Research (NBER) suggest this “rent extraction” is a primary source of the union wage premium. They are, in effect, converting company profits into worker wages.

Productivity and firm selection: It’s also true that unionized firms are not a random sample. Often, unions are more common in older, larger, and more productive firms. These firms may have been more productive to begin with, allowing them to pay higher wages. However, unions can also *contribute* to productivity by standardizing job roles, reducing turnover (which is costly), and creating formal grievance procedures that resolve disputes without disrupting work.

The spillover effect: The power of unions can even benefit non-union workers. In an industry or region with a strong union presence, non-union firms may have to raise their wages to compete for talent and prevent their own workers from deciding to organize. This “spillover” effect helps lift the entire industry’s wage floor.

The invisible barrier: Discriminatory tendencies in the workplace 🔗

We have now seen how pay can be affected by measurable, structural differences like firm size and union contracts. But we must now address a more difficult and damaging form of employer heterogeneity: discriminatory tendencies. This is when pay differences are based not on productivity, skills, or job duties, but on a worker’s personal characteristics, such as their gender, caste, race, or religion.

This is not an economic curiosity; it is a fundamental violation of the principle of “equal pay for equal work.” Yet, it persists and remains a key driver of wage differentials in labor markets around the world, including in India.

The “unexplained” gap 🔗

When economists study wage gaps, they first try to explain them with objective factors. For example, in analyzing the gender pay gap, they account for differences in education, years of experience, hours worked, industry, and occupation. But often, even after controlling for all these legitimate factors, a significant portion of the gap remains. This “residual” or “unexplained” gap is what economists generally attribute to discrimination.

In India, the situation is stark. Estimates suggest that women in India earn, on average, 19-24% less than men across all sectors. While some of this is due to differences in occupation, much of it is linked to “stereotype ideas about gender… and structural inequalities.” In some high-skill sectors, studies have found that women are, on average, *more* educated than their male colleagues but are still paid less, a clear sign of persistent gender bias.

How does discrimination work in practice? 🔗

Discrimination is not always as simple as a manager saying, “I will pay this person less because they are a woman.” It often operates in more subtle, systemic ways.

• Taste-based discrimination: This is the most direct form of prejudice. An employer (or even customers or co-workers) has a personal bias against a certain group and is willing to ‘pay’ for it. This might mean they are only willing to hire someone from that group at a lower wage, or they pay a premium to hire from their preferred group.
• Statistical discrimination: This is a more insidious form. An employer uses group averages to make assumptions about an individual. For example, a manager might assume a young married woman is more likely to leave her job to have children (even if *that specific woman* has no such plans) and may therefore be less likely to invest in her training or promote her to a high-responsibility role. This is a judgment based on a stereotype, not on the individual’s performance or potential.
• Occupational segregation: This is one of the biggest drivers. Society often “sorts” men and women into different types of jobs-think of nurses and teachers (female-dominated) versus engineers and bankers (male-dominated). The problem is that “women’s jobs” are systemically undervalued and underpaid, even when they require similar or higher levels of skill, stress, and education than “men’s jobs.”

The legal and social context 🔗

It is crucial to understand that these discriminatory gaps are not just an unfortunate economic outcome; they are a legal and ethical failure. In India, the Constitution itself lays the groundwork in Article 39, which directs the state to secure “equal pay for equal work for both men and women.”

This principle is codified in law. The Equal Remuneration Act, 1976, is the key piece of legislation. It mandates the “payment of equal remuneration to men and women workers” for performing the same or similar work and explicitly “provides for the prevention of discrimination… against women in the matter of employment.”

Despite these strong legal protections, the persistence of the pay gap shows that employer bias, whether conscious or unconscious, remains a powerful and stubborn “heterogeneity” in the labor market. It proves that the number on your paycheck is determined not just by the market, but by culture, policy, and power.

What do you think? Have you ever suspected that your pay was more about your employer’s size or policies than your own skills? How can we better enforce the ‘equal pay for equal work’ principle in practice?

References

1. https://www.researchgate.net/publication/356061929_Wages_and_Firm_Ownership_A_Study_of_the_Manufacturing_Sector_of_India
2. https://www.researchgate.net/publication/228314039_Union_Membership_Effect_on_Wage_Premiums_Evidence_from_Organized_Manufacturing_Industries_in_India
3. https://www.nber.org/digest/202508/unpacking-union-wage-premium
4. https://www.researchgate.net/publication/392112976_Closing_The_Gender_Pay_Gap_in_India_An_Analysis
5. https://clc.gov.in/clc/acts-rules/equal-remuneration-act