What is the Current Population Survey (CPS)?

The Current Population Survey (CPS) is a vital monthly survey of approximately 60,000 U.S. households conducted by the U.S. Census Bureau and the U.S. Bureau of Labor Statistics (BLS). The survey’s primary purpose is to collect data on labor force characteristics, including employment, unemployment, and other key measures related to the health of the U.S. labor market. First initiated in 1940, CPS is one of the longest-running household surveys in the United States and is a cornerstone for labor economics research, policymaking, and economic analysis.

Origins and Evolution of the CPS

The CPS was initially developed in the 1940s to address the need for more timely and reliable data on employment and unemployment. In the early stages of its history, the U.S. government relied on decennial censuses and ad hoc surveys to capture the state of employment in the country. However, with the economic challenges posed by the Great Depression and subsequent World War II mobilization, the need for a continuous, up-to-date source of labor market information became clear.

The survey’s administration was transferred to the Census Bureau and BLS in 1959, and over time, it has undergone several revisions to improve its accuracy, expand its scope, and refine its methodologies. In addition to its monthly labor force statistics, the CPS has also been adapted to include supplementary surveys that provide data on various other socioeconomic factors, such as health insurance coverage, income, and educational attainment.

Objectives of the CPS

The primary goal of the CPS is to gather comprehensive and up-to-date information about the labor market status of the U.S. civilian non-institutional population. Key objectives include:

• Measuring the employment rate: The CPS estimates the percentage of people aged 16 and older who are employed.
• Calculating the unemployment rate: One of the CPS's central functions is to provide the official national unemployment rate by measuring the percentage of the labor force that is unemployed and actively seeking work.
• Tracking labor force participation: CPS assesses how many people are active participants in the labor force, whether they are employed or unemployed but seeking work.
• Collecting data on demographics and employment patterns: The survey captures a wide range of demographic information, including age, gender, race, education level, and marital status, which allows for a detailed breakdown of employment statistics across various population groups.

Data Collection Process

The CPS operates on a rotation basis to gather data from U.S. households. Each household in the sample is surveyed for four consecutive months, then temporarily removed from the sample for eight months, and then brought back into the survey for another four months. This method ensures a balance between retaining continuity in tracking households over time and incorporating new households to maintain the sample's representativeness.

Census Bureau employees conduct the survey, and data collection is primarily done through telephone interviews or in-person visits. In addition to gathering data about labor force status, CPS interviewers ask questions about household demographics, income, and other socioeconomic factors. The survey is voluntary, but the high response rate helps ensure the data’s reliability.

Key Metrics and Data Provided by the CPS

The CPS provides a wide array of metrics, many of which are critical for understanding economic and labor trends in the U.S. These include:

• Unemployment Rate: The unemployment rate is one of the most closely watched economic indicators. It represents the percentage of people in the labor force who are unemployed and actively seeking employment. The unemployment rate is widely used by policymakers, economists, and businesses to gauge the health of the economy.
• Employment Rate: The employment rate measures the proportion of the civilian non-institutional population aged 16 and older that is employed. This statistic can be broken down by different demographic groups, such as age, gender, race, and education.
• Labor Force Participation Rate: This metric measures the percentage of the civilian non-institutional population that is either employed or actively seeking employment. It helps provide insight into how many people are participating in the labor market and whether participation is increasing or decreasing over time.
• Number of Part-Time Workers: The CPS tracks both full-time and part-time employment, providing detailed data on workers who are employed part-time either by choice or due to economic reasons (i.e., involuntary part-time workers).
• Duration of Unemployment: The survey also gathers information on how long people have been unemployed, which is important for understanding long-term unemployment trends and their impact on individuals and the economy.
• Occupational and Industry Data: CPS data can be analyzed to show employment and unemployment rates by industry and occupation, helping to identify which sectors are growing or shrinking.

CPS Supplements

In addition to its core labor force questions, the CPS includes several supplemental surveys throughout the year. These supplements collect data on a variety of topics, providing valuable insights into other aspects of the U.S. population. Some of the most notable CPS supplements include:

• Annual Social and Economic Supplement (ASEC): Conducted every March, the ASEC collects detailed information on income, poverty, and health insurance coverage. It is one of the most widely used sources for analyzing household income distribution and poverty levels in the United States.
• School Enrollment Supplement: This supplement provides data on school enrollment patterns, including high school and college attendance. It helps track educational attainment and trends in the U.S. education system.
• Voting and Civic Engagement Supplement: Conducted in even-numbered years, this supplement gathers data on voter registration and participation in elections, along with other forms of civic engagement.
• Food Security Supplement: This supplement, conducted in December, gathers information on food security and hunger in U.S. households, allowing for an assessment of how many households are facing food insecurity and to what extent.

How the CPS Influences Policy and Research

The CPS serves as an invaluable resource for policymakers, economists, social scientists, and business leaders who rely on its data to inform decisions and conduct research. Some of the ways CPS data are used include:

• Labor Market Policies: The CPS provides timely data on employment and unemployment trends, helping policymakers craft responses to changing economic conditions. For example, the CPS unemployment data are often used to guide decisions regarding monetary policy, unemployment benefits, and workforce development programs.
• Social Programs: Data from the CPS, especially from its supplements like the ASEC, are critical for assessing the impact of social programs such as Social Security, Medicare, and Medicaid. The poverty statistics derived from CPS data are also used to evaluate the effectiveness of various anti-poverty measures and inform changes to safety net programs.
• Academic and Economic Research: Economists and social scientists use CPS data to conduct research on a wide range of topics, including income inequality, labor market dynamics, and demographic trends. The data are essential for understanding long-term trends and making cross-sectional comparisons between different population groups.

Limitations of the CPS

While the CPS is a robust and valuable tool, it is not without limitations. Some of these include:

• Self-Reported Data: The CPS relies on respondents to provide accurate information about their labor force status, income, and other personal details. While the Census Bureau employs rigorous quality control measures, self-reported data can still be prone to errors or misreporting.
• Sample Size: Although 60,000 households are surveyed each month, this sample size may not be large enough to provide reliable estimates for smaller subgroups or regional analyses.
• Survey Design and Definitions: The CPS uses specific definitions for terms like "unemployment," "labor force participation," and "employment," which may not fully capture all aspects of labor market behavior, such as underemployment or discouraged workers.

The Bottom Line

The Current Population Survey (CPS) is a critical tool for measuring the state of the U.S. labor market. Its data provide essential insights into employment trends, unemployment rates, and labor force participation. While the CPS has its limitations, its long history, regular updates, and extensive coverage make it one of the most reliable and widely used sources of labor market information. The CPS is indispensable for policymakers, researchers, and economists, offering a detailed snapshot of the economic well-being of the nation’s workforce.