Week 4
Class and Social Stratification

Soci—269

Sakeef M. Karim
Amherst College

AN INTRODUCTION TO QUANTITATIVE SOCIOLOGY—CULTURE & POWER

Class, Networks, Inequality–
September 24th

A Quick Reminder

Response Memos

Response Memo Deadline

Your third response memo—which has to be between 250-400 words and posted on our Moodle Discussion Board—is due by 8:00 PM tonight.

Class and Inequality–
Measurement

A Group Exercise

This may sound familiar. In groups of 2-3, think about class inequality. Propose a theory of how “class” divisions emerge and persist.
How could you test your theory?

Once again, think broadly here: e.g., how would you operationalize constructs like class and inequality?

Inequality and Social Ties
(Young et al. 2025)

The Entry Point

Social ties provide access to valuable resources—such as job opportunities, information, and social support—that can increase well-being and facilitate upward mobility … Yet, these same networks can also reinforce and perpetuate inequality when concentrated among the advantaged. Those with well-connected, high-status networks often enjoy greater access to exclusive opportunities, whereas individuals with weaker networks may face persistent barriers to advancement, further compounding inequality … Do personal connections, community interactions, and network resources help diffuse opportunity throughout society, or do they reinforce economic differences and build social closure among the well-off?

(Young et al. 2025:294, EMPHASIS ADDED)

The Entry Point

We focus on two key distributional dimensions of social ties: their quantity and their alignment with economic capital … First, to what extent do some individuals have an abundance of social ties, while others have very few? … Second, what is the relationship between social ties and income? Do high-income individuals also have larger and more advantageous social networks than low-income earners? A weak correlation would suggest that social and economic resources operate as distinct domains—some individuals may have high income, whereas others are rich in social connections. This is similar to Weber’s idea that dimensions such as “class” and “status” represent separate axes of societal differentiation.

(Young et al. 2025:294–95, EMPHASIS ADDED)

The Research Questions—Reframed

The Research Questions—Reframed

The Research Questions—Reframed

The Findings

Personal Networks

Figure 1  from Young and colleagues (2025). Click to expand.

The Findings

Group Memberships

Figure 2  from Young and colleagues (2025). Click to expand.

The Findings

Network Resources

Figure 3  from Young and colleagues (2025). Click to expand.

The Findings

Figure 4  from Young and colleagues (2025). Click to expand.

The Findings

Aggregate Inequality-Consolidation Curve

Figure 5  from Young and colleagues (2025). Click to expand.

A Quick Classroom Discussion

Homophily, Consolidation and Inequality

How do Young et al.’s (2025) findings relate to Zhao and Garip’s (2021) conclusions about homophily and consolidation?

The Multiverse
(Engzell and Mood 2023)

An Animating Question

The late-twentieth century saw earnings and wealth inequality rise in most Western countries. This has sparked concerns about the consequences for younger generations. Do increased disparities mean a child’s family of upbringing has become more important as a predictor of their attainment as an adult? Research to date provides no conclusive answer: studies in the United States and in Scandinavia—the context of this study—report everything from no trend to a decrease in income mobility, or even a slight increase.

(Engzell and Mood 2023:600, EMPHASIS ADDED)

An Animating Question

A Question About a Question What explains these inconsistent findings?

An Animating Question

The literature on intergenerational income mobility works with a wide range of models and definitions. While the question “Has mobility decreased?” is generic, different models can speak to different estimands (Lundberg, Johnson, and Stewart 2021). If so, variation is an irreducible feature, and no matter how much data we have, studies may not converge on a single answer.

(Engzell and Mood 2023:601, EMPHASIS ADDED)

An Animating Question

As we will argue, the way forward lies in treating model variation not as a nuisance but as an indispensable source of information. We ask how levels of and trends in intergenerational income mobility depend on the choice of income concept, differences between men and women, the age and period at which income is measured, how zero values are treated, and the parameter of association. Our use of a single high-quality dataset lets us abstract from variation due to context, sampling, or measurement error. We examine 20 cohorts and 82,944 alternative specifications.

(Engzell and Mood 2023:601, EMPHASIS ADDED)

A Model of Intergenerational Mobility

Figure 1  from Engzell and Mood (2023).

Select Results

Figure 3  from Engzell and Mood (2023). Click to expand.

Select Results

Figure 4  from Engzell and Mood (2023). Click to expand.

Select Results

Figure 6  from Engzell and Mood (2023).

The Revised Theory

Selecting a given specification to test a prediction such as “mobility is declining,” we would have been likely to confirm it. By contrast, examining the full model space we can begin to address questions not only of if but why. In our case, the striking conclusion is that rising gender equality, not inequality, is the main driver of declining income mobility in Sweden today. Intergenerational correlations rise over time because women’s earnings become a better proxy for their underlying human capital, and this also influences family income. Our results show that rising intergenerational persistence can be a result of something most would see as desirable: gender equalization in the labor market.

(Engzell and Mood 2023:619, EMPHASIS ADDED)

Note

For another paper on the intergenerational transmission of “class” in Sweden, see Engzell and Wilmers (2025).

Another Group Discussion

Battling “Researcher Degrees of Freedom”

In groups of 2-3, carefully link Engzell and Mood’s (2023) abductive multiverse analysis framework to the big, diverse data approach to estimation deployed by Young et al. (2025).

A Final Group Discussion

Segregation and Inference

Mijs and Usmani (2024) posit that segregation ruins inference. What in the world are they talking about? How did they arrive at their conclusions? Discuss in groups of 2-3.

Enjoy the Weekend

References

Note: Scroll to access the entire bibliography

Engzell, Per, and Carina Mood. 2023. “Understanding Patterns and Trends in Income Mobility Through Multiverse Analysis.” American Sociological Review 88(4):600–626. doi: 10.1177/00031224231180607.
Engzell, Per, and Nathan Wilmers. 2025. “Firms and the Intergenerational Transmission of Labor Market Advantage.” American Journal of Sociology 131(2):322–70. doi: 10.1086/736993.
Lundberg, Ian, Rebecca Johnson, and Brandon M. Stewart. 2021. “What Is Your Estimand? Defining the Target Quantity Connects Statistical Evidence to Theory.” American Sociological Review 86(3):532–65. doi: 10.1177/00031224211004187.
Mijs, Jonathan J. B., and Adaner Usmani. 2024. “How Segregation Ruins Inference: A Sociological Simulation of the Inequality Equilibrium.” Social Forces 103(1):45–65. doi: 10.1093/sf/soae033.
Young, Cristobal, Benjamin Cornwell, Barum Park, and Nan Feng. 2025. “Inequality and Social Ties: Evidence from 15 U.S. Data Sets.” Sociological Science 12:294–321. doi: 10.15195/v12.a14.
Zhao, Linda, and Filiz Garip. 2021. “Network Diffusion Under Homophily and Consolidation as a Mechanism for Social Inequality.” Sociological Methods & Research 50(3):1150–85. doi: 10.1177/00491241211014237.