Related Experiment Video
Updated: May 22, 2026

10:50
Using the FishSim Animation Toolchain to Investigate Fish Behavior: A Case Study on Mate-Choice Copying In Sailfin Mollies
Published on: November 8, 2018
Educational assortative mating and income inequality in Denmark
Richard Breen1, Signe Hald Andersen
1Department of Sociology, Yale University, New Haven, CT, USA. richard.breen@yale.edu
Demography
|May 29, 2012
Summary
Changes in educational assortative mating increased income inequality in Denmark. These shifts were driven by evolving educational distributions among men and women, not by changing partner selection preferences.
Area of Science:
- Sociology
- Economics
- Demography
Background:
- Growing concern exists regarding educational assortative mating's potential to increase household income inequality.
- Denmark, known for low income inequality, experienced rising inequality and declining educational homogamy from 1987-2006.
Purpose of the Study:
- To investigate the relationship between educational assortative mating and income inequality in Denmark.
- To determine the drivers of changes in income inequality related to educational pairing.
Main Methods:
- Utilized Danish register data covering the entire population's exact incomes.
- Analyzed trends in educational assortative mating and income inequality between 1987 and 2006.
Main Results:
- Educational assortative mating changes were found to increase income inequality.
- The primary drivers were shifts in the educational distributions of men and women, not changes in partner selection propensities.
Conclusions:
- Changes in educational distributions significantly impact income inequality through assortative mating.
- Policy and social trends affecting educational attainment levels are crucial for understanding income disparity.
Related Concept Videos
Mate Choice
Mate choice—the decision about whom to mate with—is a type of natural selection, since animals must reproduce to pass down their genes. Mate choice is also called intersexual selection because the behavior occurs between the sexes.
Punnett Squares
Overview
Close Relationships and Culture
Culture shapes how people approach attraction, choose partners, and build long-term relationships. While some preferences in mate selection appear consistent across cultures, such as men valuing physical attractiveness and women emphasizing financial resources, cultural contexts influence how these preferences are expressed and prioritized. Marriage extends beyond romantic ideals in many societies and is deeply embedded in social, economic, and religious frameworks.The Role of Culture in Mate...
Outliers and Influential Points
An outlier is an observation of data that does not fit the rest of the data. It is sometimes called an extreme value. When you graph an outlier, it will appear not to fit the pattern of the graph. Some outliers are due to mistakes (for example, writing down 50 instead of 500), while others may indicate that something unusual is happening. Outliers are present far from the least squares line in the vertical direction. They have large "errors," where the "error" or residual is the vertical...
Inclusive Fitness
Most altruistic behavior—in which one animal helps another at a cost to themselves—occurs between relatives. Scientists think these altruistic behaviors evolved because they increase the inclusive fitness of the animal providing help.
Skewness
The measures of central tendency calculated from a data set may not reveal much about its intrinsic distribution. If a plot is made of the data set’s values, the mean and the median may not only differ, but also the plot may have more values on one side of the central tendencies. Such a data set is said to be skewed towards that side.
The longer the tail of the plot on one side, the more skewed it is. The skewness of a data set’s values suggests that the measures of central tendency are...
The longer the tail of the plot on one side, the more skewed it is. The skewness of a data set’s values suggests that the measures of central tendency are...

