Disparate Effect

Disparate Effect, also known as Adverse Impact, refers to policies, practices, rules, or other systems that appear to be neutral but result in a discriminatory effect on a protected group. It's a legal concept primarily used in employment practices, where certain eligibility requirements or decisions unintentionally disproportionately affect individuals of a certain race, sex, or ethnic group. Under the U.S. legal framework, any employer policies causing a disparate effect might be considered discriminatory unless they are strongly job related and necessary to business operations.

Last updated: August 26, 2023 12 min read

What Is the Concept and Implications of "Disparate Effect" in Employment Law?

In employment law, "Disparate Effect" (often referred to as "Disparate Impact") is a term used to describe a policy, practice, or rule that seems neutral, but has a discriminatory effect on a protected group.

For instance, a company policy that requires all employees to work on Saturdays could potentially have a disparate effect on employees who observe the Sabbath on that day for religious reasons. Even though the policy applies to everyone equally and does not directly target anyone based on religion, it could still have a disproportionate and adverse impact on certain religious groups.

It's important to note that under U.S. law, a claim of disparate impact discrimination actually does not require the proving of an intent to discriminate. Employers can be found liable for disparate impact discrimination if their policies or practices have the effect of discrimination, regardless of intent. They may defend such claims by demonstrating that the policy or practice is related to the job and necessary for the business. If there's an alternative approach that meets the business's needs and reduces the disparate impact, the employer may be required to adopt it.

What Is the Historical Evolution or Development of the 'Disparate Effect' Concept in Law?

The historical evolution of the 'Disparate Effect' or 'Disparate Impact' concept in law dates back to the 1960s and 70s and is closely tied to the American Civil Rights Movement and U.S. legislation.

  1. Passing of the Civil Rights Act, 1964 - The Civil Rights Act, in particular Title VII, prohibited discrimination based on race, color, religion, sex, or national origin. Initially, it focused mainly on intentional and overt discrimination, known as 'Disparate Treatment'.

  2. Griggs vs. Duke Power Co., 1971 - This was the landmark Supreme Court case that significantly developed the concept of 'Disparate Impact'. In this case, Duke Power Company was using high school diplomas and aptitude tests as hiring criteria for certain jobs. It was found that these standards disqualified African Americans at a significantly higher rate, despite being unrelated to job performance. The court ruled that practices which are fair in form but discriminatory in operation could still be unlawful, thereby recognizing Disparate Impact as unlawful.

  3. Wards Cove Packing Co. vs. Atonio, 1989 - This case weakened the 'Disparate Impact' theory, requiring the burden of proof to rest entirely on the employees. They had to identify the specific employment practice causing the Disparate Impact and prove a causal relationship.

  4. Civil Rights Act, 1991 - In response to the Wards Cove decision, Congress amended Title VII via the 1991 Civil Rights Act, reinstating many elements of the 'Disparate Impact' theory from the Griggs case. It placed the burden back onto employers to show that a practice causing a disparate impact was a 'business necessity'.

While evolving significantly over the years, the concept of 'Disparate Impact' has become a cornerstone of anti-discrimination laws and policies, extending beyond employment to areas such as housing and education.

What Is the Methodology for Measuring the Disparate Impact in Employment Practices?

Measuring disparate impact in employment practices can be a complex process, requiring careful data analysis and statistical inference. Here is a general methodology:

  1. Identify Protected Groups: Start by identifying which group or groups are protected under anti-discrimination laws (e.g., based on race, sex, age, religion, etc.).

  2. Collect Relevant Data: Gather data on the employment practice or policy in question. This might include data on hiring, promotions, terminations, and other relevant metrics broken down by the identified protected groups.

  3. Conduct a Statistical Analysis: Compare the outcomes of the employment practice or policy for the protected group versus others. Typically, this involves calculating the rate at which each group is affected by the policy or practice.

  4. Calculate Disparity Ratios: If the rate at which the protected group is affected is less than 80% that of the other group(s), this is known as the "Four-Fifths Rule," "80 Percent Rule," or "Adverse Impact Ratio," and there may be an indication of disparate impact. This rule of thumb was established by the U.S. Equal Employment Opportunity Commission (EEOC).

  5. Determine Statistical Significance: Determine whether the observed disparity is statistically significant. This often requires the use of statistical tests like chi-square.

  6. Examine Causation: If a significant disparity is found, determine whether the practice or policy in question is its cause. This typically requires thorough investigation and potentially expert testimony.

  7. Consider Business Necessity: Even if a disparate impact is found, the practice or policy might still be lawful if the employer can demonstrate it is a "business necessity" and no less discriminatory alternative exists.

The full process often requires a multidisciplinary approach, involving HR professionals, data scientists, and legal experts.

What Are Some Real-World Examples of Disparate Impact in Employment Practices?

Here are a few real-world examples of disparate impact in employment practices:

  1. Height and Weight Requirements: Some jobs, such as those in law enforcement or firefighting, used to have strict height or weight requirements. These could inadvertently discriminate against certain ethnic groups, women, or individuals with disabilities, who may not meet these requirements due to factors outside of their control.

  2. Physical Ability Tests: Certain jobs may require stringent physical ability tests, such as the ability to lift a certain weight or run a certain distance within a specific time frame. While these tests may seem fair on their surface, they could disproportionately exclude women or older individuals, thereby having a disparate impact.

  3. Aptitude and Skills Tests: Some companies use aptitude tests to screen potential employees. If these tests aren't directly related to job performance or if there's a less discriminatory alternative that still serves the company's needs, they could disproportionately disadvantage certain groups, creating a disparate impact.

For instance, an employer requiring high scores on a math test for a job that does not require math skills would have a disparate impact on applicants who didn't have the opportunity to receive a high level of education.

  1. 'No-Beard' Policies: Some companies have grooming policies that disallow beards. This could unintentionally discriminate against men who have pseudofolliculitis barbae (a skin condition prevalent among African-American men that causes severe irritation when shaving), creating a disparate impact based on race.

In each of these examples, the business policy or practice may seem neutral and apply to all employees or applicants. However, it disproportionately affects a particular group protected under anti-discrimination laws, leading to a disparate impact. The legality of these practices often depends on whether the requirements are a "business necessity" and if there is a less discriminatory alternative available.

What Are Some Examples of Disparate Impact?

Disparate impact can be found in various aspects of society, not only employment, but also in housing, education, and public policy. Here are a few examples:

  1. Housing: A property management company has a policy of not renting to individuals with prior arrests, regardless if they led to convictions or not. This could disproportionately impact ethnic minorities who have higher arrest rates, thus leading to a disparate impact.

  2. Education: A school district's use of standardized tests for admission into gifted or advanced programs may disproportionately disadvantage low-income or minority students who historically score lower on these tests due to inequalities in access to resources. This could be seen as having a disparate impact, unless the school district can prove that the test is necessary and there is no less disadvantageous measure available.

  3. Public Policy: Certain voting laws requiring a state-issued ID can disproportionately impact elderly or low-income citizens who may not have such ID for various reasons. This could be seen as having a disparate impact on these populations.

  4. Credit and Lending Practices: Policies by financial institutions that anchor loan availability or interest rates to certain neighborhoods (a practice known as 'redlining') may disproportionately affect individuals of certain races or socio-economic backgrounds, resulting in a disparate impact.

  5. Insurance Policies: An insurance company's use of credit scores to determine premium rates could have a disparate impact. If people of a certain race or socio-economic status statistically have lower credit scores due to systemic factors, they may be disproportionately paying higher premiums.

In each case, the policies aren't overtly discriminatory, but they could lead to a disparate or disproportionate impact on a specific protected group.

What Are Instances Where Workplace Policies Have Resulted in Adverse Impact?

Here are a few instances where seemingly neutral workplace policies have resulted in an adverse impact on a specific demographic group:

  1. Inflexible Work Hours: A policy requiring all employees to work from 9 to 5 may have a disparate impact on those with caregiving responsibilities, who are predominantly women. This may result in fewer women in the workplace or limit their chances of promotion if they can't adhere to this schedule.

  2. Physical Fitness Tests: In certain physical or emergency service jobs, rigid physical fitness standards can disproportionately exclude female or older applicants, who may not be able to meet the same physical benchmarks as young, male counterparts.

  3. Education Requirements: Requiring a college degree for positions where it's not essential to perform the job could disproportionately affect candidates from socio-economically disadvantaged backgrounds who may not have had the same access to higher education.

  4. Criminal Background Checks: Companies that reject potential employees who have a criminal record could inadvertently discriminate against certain racial or ethnic groups that are disproportionately represented in the criminal justice system.

  5. Hiring Based on Current Employment: Some employers prioritize applicants who are already employed, but this can disproportionately disadvantage groups that have higher rates of unemployment due to economic downturns or other systemic factors.

These examples highlight that even when a policy or practice is applied universally and is not intentionally discriminatory, it can still result in a disparate or adverse impact on a specific protected group.

What Factors or Policies Contribute to the Occurrence of Disparate Impact in Businesses?

Several factors and policies can contribute to the occurrence of disparate impact in businesses. Here's a brief list:

  1. Subjective Evaluations: If employee performance evaluations are based largely on subjective criteria, unconscious bias could potentially lead to disparities in ratings that adversely impact certain groups.

  2. Strict Physical or Psychological Requirements: Unnecessarily stringent physical or mental ability standards can have a disparate impact particularly on protected groups such as women, older employees, or individuals with disabilities if the requirements aren't a business necessity or directly related to job performance.

  3. Hiring Based on Referrals: A reliance on employee referrals can reinforce existing demographics within a company and exclude diverse talent, resulting in a potential disparate impact on minority groups.

  4. Use of Artificial Intelligence (AI) and Algorithms: AI and algorithms have the potential to reinforce historical biases and lead to disparate impact if the data used to train these systems included bias and discrimination.

  5. Education or Experience Requirements: If a position requires a degree or a certain level of experience not directly connected to job performance, it may disproportionately exclude candidates from underprivileged backgrounds, potentially leading to disparate impact.

  6. Criminal Background Checks: While security and safety are important, these checks need to be closely related to the job requirements and responsibilities. The way they are applied can easily create unintentional discrimination or disparate impact.

  7. English Language Requirements: If a job unnecessarily requires English proficiency, it may discriminate against those for whom English isn't a first language, creating disparate impact.

The key here is whether these policies can be justified as business necessities and whether there are any alternative policies available that are less discriminatory. If not, employers may be found liable for disparate impact discrimination.

What Factors Can Predict the Occurrence of Disparate Impact in a Business?

Several factors can predict the potential occurrence of disparate impact in a business:

  1. Non-Diverse Leadership and Workforce: If company's leadership and workforce lacks diversity, it could be a sign of potential disparate impact. When leadership and workforce don't represent diverse backgrounds, it can be an indication that hiring or promotion policies might be creating barriers for protected groups.

  2. Legacy Policies and Practices: Older, grandfathered policies and practices that have not been updated to align with current anti-discrimination standards could potentially perpetuate a disparate impact.

  3. High Attrition Rates among Protected Groups: If a business experiences higher than average attrition rates among members of a certain demographic or protected group, it could indicate a potential disparate impact.

  4. Dependence on Subjective Evaluation Criteria: Companies that rely heavily on subjective evaluations for promotions, rewards, or acknowledgment could potentially be favoring certain groups over others.

  5. History of Lawsuits or Complaints: If a business has faced previous lawsuits or complaints related to discrimination or has been the subject of frequent EEOC (Equal Employment Opportunity Commission) investigations, this might predict future occurrences of disparate impact.

  6. Lack of Accessibility and Accommodation: If a business doesn't provide necessary support and accommodation for disabled employees, or lacks policies supporting equal opportunity and inclusivity, it could be creating conditions for disparate impact.

  7. Inadequate Training: Training and development opportunities that are not equitably accessible to all employees could create opportunities for disparate impact.

Remember, these factors don't guarantee that disparate impact will occur, but they could increase the risk. Businesses can mitigate these risks by reviewing their policies and practices regularly to ensure that they are fair and compliant with anti-discrimination laws.

What Are the Detrimental Consequences of Disparate Impact in Employment Practices?

Disparate impact in employment practices can lead to several detrimental consequences for businesses and society at large, such as:

  1. Legal Repercussions: Businesses could face costly lawsuits, penalties, and damage to their reputation if found guilty of practices that result in disparate impact. It can also lead to increased scrutiny from regulatory bodies.

  2. Loss of Talent: Discriminatory practices limit the pool of potential candidates, which could result in businesses missing out on exceptionally talented individuals who could have contributed positively to the company.

  3. Decreased Morale and Employee Engagement: Employees who feel they, or others, are being treated unfairly due to discriminatory policies or practices, are likely to have lower job satisfaction and engagement. This can lead to lower productivity and higher employee turnover.

  4. Damage to Company Reputation: If a business is known for discriminatory practices, they may lose the support of consumers who prioritize social justice and equitable practices, leading to potential loss of revenue.

  5. Innovation Stifled: Diverse teams are known to produce more innovative ideas and solutions. By limiting diversity through discriminatory practices, firms could be stifling their own potential for innovation and growth.

  6. Societal Impact: Beyond the impact on individual businesses, disparate impact in employment practices contributes to societal inequality, including economic disparities and social injustice.

Organizations can greatly reduce these risks by promoting equitable hiring practices, ensuring diversity at all levels, and regularly examining and adjusting their policies and practices to ensure they don’t lead to disparate impacts.

What Strategies Can Be Implemented to Mitigate the Disparate Impact in Employment Practices?

There are several strategies businesses can implement to mitigate disparate impact in their employment practices:

  1. Regularly Review Policies and Practices: This includes assessing recruitment strategies, the language in job advertisements, performance evaluations, promotion practices, etc., to ensure they are fair and do not inadvertently disadvantage certain groups.

  2. Establish Clear Job Requirements: Make sure the qualifications needed for a job are directly related to the execution of that job and are not unnecessarily exclusive.

  3. Diversity and Inclusion Training: Implement programs to educate managers and employees about unconscious bias and promote an inclusive workplace culture.

  4. Data Analysis and Monitoring: Use data analytics to assess the impact of employment practices on different groups. Regular monitoring can help identify any potential disparate impacts early.

  5. Transparent and Objective Evaluation Criteria: Use clear, objective standards to evaluate employee performance and make hiring or promotional decisions. Avoid relying on subjective evaluations that could inadvertently lead to bias.

  6. Broaden Recruitment Efforts: To reach a diverse applicant pool, companies should advertise job openings through various channels that cater to diverse demographics.

  7. Ensure Equal Access to Development Opportunities: Providing all employees with equal opportunities for training and development not only promotes fairness but could also help mitigate disparities over time.

Remember, ensuring that there is no disparate impact in employment practices requires continuous effort and commitment to fairness, equality, and diversity at all levels of the organization.

Which Employers Are Most Susceptible to Experiencing Disparate Impact in Their Practices?

Disparate impact can occur in any organization, regardless of size or industry. However, certain types of employers might be more susceptible due to the nature of their business, their practices, or workforce composition. These include:

  1. Large Corporations: Larger employers tend to have more complex hiring and promotion processes, which could inadvertently lead to discriminatory practices if not properly managed.

  2. Employers with Non-Diverse Workforces: Companies that lack diversity, whether in terms of race, gender, age, or other protected classes, may be more prone to disparate impact if their policies and practices result in certain groups being underrepresented.

  3. Industries Requiring Specific Physical Abilities or Skills: Sectors such as law enforcement, firefighting, construction, or professional sports, which often have rigid physical ability requirements, might face issues of disparate impact on women, older individuals, or people with disabilities if these criteria aren't strictly necessary for job performance.

  4. Companies with Outdated Policies: Businesses that haven't updated their policies to align with contemporary anti-discrimination laws and regulations might inadvertently foster practices resulting in a disparate impact.

  5. Companies Relying Heavily on Algorithms for Decision Making: Firms using AI or algorithms for recruitment or promotion decisions can unwittingly trigger disparate impact if their algorithms intensify existing biases in the data they're trained on.

Despite this susceptibility, it's important to note that all employers can take proactive steps to reduce the risk of disparate impact in their practices, ensuring a more diverse, inclusive, and equitable workplace.

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