Author: Taylor Warfield, Former Bain Manager and Interviewer

Last Updated: March 31, 2026

Cornerstone Research case interviews test your ability to think like an economist, not a management consultant. Unlike McKinsey or BCG cases that focus on profitability and market entry, Cornerstone Research cases center on litigation and economic analysis, such as estimating securities fraud damages or determining whether a company's lost profits were actually caused by patent infringement.

 

In my experience coaching candidates for economic consulting interviews, Cornerstone Research is one of the most misunderstood firms. Candidates often prepare with standard case interview frameworks and are surprised when the actual interview requires regression concepts, causal reasoning, and damages estimation.

 

This guide covers everything you need to know to pass your Cornerstone Research case interview, including the exact interview format, the economic concepts that come up most often, walkthroughs of real case examples from Cornerstone Research's own website, and the strategies that give you the best shot at an offer.

 

But first, a quick heads up:

 

McKinsey, BCG, Bain, and other top firms accept less than 1% of applicants every year. If you want to triple your chances of landing interviews and 8x your chances of passing them, watch my free 40-minute training.

 

What Changed in 2026?

 

This article has been fully rewritten to reflect how Cornerstone Research actually interviews candidates. Key updates include a detailed breakdown of the two-round interview process sourced from Cornerstone Research and Glassdoor, walkthroughs of the official case examples published on Cornerstone Research's website, a new section covering economic concepts you need to know, and a comparison table showing how CR cases differ from standard consulting cases.

 

What Is a Cornerstone Research Case Interview?

 

A Cornerstone Research case interview is a 30 to 45-minute exercise in which you work through an economic or financial analysis problem alongside the interviewer. The goal is to assess your reasoning, not to see if you memorized a consulting framework.

 

Cornerstone Research is an economic consulting firm, not a management consulting firm. The firm provides financial and economic analysis for commercial litigation, regulatory proceedings, and expert testimony. According to Cornerstone Research's website, they have worked on cases involving securities fraud, antitrust violations, intellectual property disputes, and consumer fraud across virtually every major industry.

 

Because of this, Cornerstone Research case interviews look very different from the profitability or market entry cases you would get at McKinsey, BCG, or Bain. Instead, you might be asked to:

 

• Estimate the damages a company's shareholders suffered from an executive's misconduct

 

• Determine whether a competitor's patent infringement actually caused your client's lost profits

 

• Analyze market data to identify evidence of price-fixing in an antitrust case

 

• Evaluate whether a pharmaceutical company's product-hopping strategy harmed generic competitors

 

No specialized knowledge in law or economics is required. Cornerstone Research designs these cases so that candidates from any academic background can succeed. What matters is your ability to think logically, interpret data, and communicate your reasoning clearly.

 

How Is the Cornerstone Research Interview Process Structured?

 

Cornerstone Research has two rounds of interviews for analyst and associate positions. According to Glassdoor data from over 640 interview reviews, the hiring process averages about 17 days from start to finish, with a difficulty rating of 3.3 out of 5.

 

What Happens in the First Round?

 

The first round consists of two back-to-back 30-minute virtual interviews. Each interview includes a discussion of your background and interests, behavioral questions, a case interview, and time for you to ask questions. According to Glassdoor, about 69% of candidates rate the interview experience as positive, and interviewers are generally described as friendly and helpful.

 

The first-round case is typically more accessible. You will likely be asked to interpret data, identify patterns, and reason through an economic scenario. Having a basic understanding of concepts like correlation versus causation is helpful at this stage.

 

What Happens in the Final Round?

 

The final round is a multi-hour in-person event at one of Cornerstone Research's offices. It consists of four 45-minute interviews plus an informal lunch or virtual chat with current staff. Each interview follows the same format as the first round but goes deeper.

 

The final-round cases are more technical. Based on candidate reports, you may need to work with regression concepts, understand statistical significance, or reason through more complex financial scenarios such as damages estimation or market analysis. Mental math skills become more important in this round.

 

	First Round	Final Round	Key Difference
Format	Virtual (Zoom)	In-person at office	Final round is on-site
Number of Interviews	2 back-to-back	4 back-to-back + lunch	Final round is much longer
Duration Per Interview	30 minutes each	45 minutes each	More time for deeper cases
Case Difficulty	Accessible, data interpretation	Technical, regression and damages	Final round tests deeper economics
Behavioral Questions	Background, why economic consulting	Deeper fit, motivation, teamwork	Both rounds test fit

 

What Does a Cornerstone Research Case Interview Assess?

 

According to Cornerstone Research's own interview guide, case interviews assess your thought process, comprehension skills, and ability to articulate ideas. Having coached hundreds of candidates, I break these down into five specific skills that interviewers are evaluating:

 

Structured thinking: Can you break down a complex economic question into smaller, logical components? Interviewers want to see that you approach problems methodically rather than jumping to conclusions.

 

Analytical problem solving: Can you interpret data, perform calculations accurately, and identify what analysis would help answer the question? This is especially important because Cornerstone Research analysts work with data from day one.

 

Business and economic reasoning: Do you understand basic economic concepts well enough to apply them to real-world scenarios? You do not need an economics degree, but you should be able to think about causation, market dynamics, and financial relationships.

 

Communication skills: Can you explain your reasoning clearly and concisely? Cornerstone Research consultants regularly present analysis to attorneys and expert witnesses, so clear communication is critical.

 

Coachability and cultural fit: Are you receptive to feedback during the case? Cornerstone Research interviewers often give hints and guidance. Your ability to incorporate that feedback in real time is a strong positive signal.

 

How Do Cornerstone Research Cases Differ from Standard Consulting Cases?

 

If you have been preparing for cases at firms like McKinsey, BCG, or Bain, you need to adjust your approach for Cornerstone Research. The differences are significant. In my experience, the biggest mistake candidates make is walking into a Cornerstone Research interview with a standard profitability framework and trying to force-fit it to a litigation case.

 

Dimension	Standard Consulting Cases (MBB)	Cornerstone Research Cases
Case type	Business strategy (profitability, market entry, M&A)	Economic and litigation analysis (damages, causation, market studies)
Format	Mix of candidate-led and interviewer-led	Mostly interviewer-led
Frameworks	Custom frameworks with 3-4 buckets (e.g., market, competition, capabilities, profitability)	Less framework-heavy; focus on hypothesis-driven economic reasoning
Math focus	Revenue/cost calculations, market sizing	Regression interpretation, damages estimation, but-for analysis
Key skill tested	Business judgment and strategic thinking	Causal reasoning and data interpretation
Recommendation	Should the client enter this market / pursue this strategy?	How much did this misconduct damage the plaintiff? What caused the revenue decline?

 

What Economic Concepts Should You Know for Cornerstone Research?

 

You do not need a PhD in economics to pass a Cornerstone Research case interview. But you do need to understand a handful of core concepts that come up regularly. Based on candidate reports and Cornerstone Research's own published case examples, these are the most important:

 

Regression analysis: You should understand what a regression does at a high level. It models the relationship between a dependent variable (like stock price) and one or more independent variables (like market index returns). You will not be asked to run a regression, but you should understand how to interpret one and why it would be useful.

 

Causation vs. correlation: This is the single most tested concept in Cornerstone Research interviews. Can you distinguish between two things happening at the same time and one thing actually causing the other? Many litigation cases hinge on exactly this question.

 

Event studies: An event study isolates the impact of a specific event (like a news announcement) on a company's stock price by controlling for other factors. This concept appears directly in Cornerstone Research's published case examples.

 

Damages estimation and "but-for" analysis: In litigation, damages are often calculated as the difference between what actually happened and what would have happened "but for" the misconduct. You should understand this framework at a conceptual level.

 

Controlling for confounding variables: When you observe a change (like declining revenue), you need to consider all the possible explanations before attributing it to one cause. This means thinking about economy-wide factors, industry trends, and company-specific events separately.

 

Elasticities: According to multiple candidate reports, elasticity concepts (how sensitive one variable is to changes in another) come up in final-round interviews. Knowing the basics of price elasticity of demand is sufficient.

 

How Do You Solve a Cornerstone Research Case Interview?

 

The overall approach shares some similarities with standard case interviews, but the execution is different. Here are the six steps to follow:

 

Step 1: Understand the Case and Identify the Core Question

 

The interviewer will walk you through a scenario, usually involving a legal dispute or economic question. Take detailed notes on the parties involved, the allegation or business question, and the specific objective you need to address. Cornerstone Research's own interview tips emphasize that you should break down questions into smaller parts to organize your thoughts.

 

The core question in a Cornerstone Research case is almost always about causation or quantification. For example: Did Company A's actions cause Company B to lose revenue? If so, how much?

 

Step 2: Think About What Data or Analysis You Would Need

 

Rather than building a traditional MECE framework with buckets like "market attractiveness" or "competitive landscape," think about what evidence would help you answer the core question. What data would you want? What analysis could isolate the effect you are trying to measure?

 

For instance, if the question is whether patent infringement caused lost profits, you might want to compare the customer bases of both companies, look at industry trends, and analyze whether alternative explanations exist for the revenue decline.

 

Step 3: Analyze the Data the Interviewer Provides

 

Cornerstone Research cases are interviewer-led, meaning the interviewer will guide you through data, charts, and follow-up questions. When you receive data, start by explaining what the data shows and what it means for the case. Do not just read numbers off a chart. Interpret the implications.

 

Step 4: Consider Alternative Explanations

 

This is where Cornerstone Research cases diverge most sharply from standard consulting cases. The interviewer will expect you to think critically about whether the alleged cause is actually the real cause. Could market-wide factors explain the outcome? Could a competitor's entry or a technology shift be responsible?

 

In one of Cornerstone Research's published case examples, the plaintiff claimed that patent infringement caused their revenue decline. But the actual analysis showed that a new technology had made the plaintiff's products obsolete, and the defendant had expanded the market rather than stealing customers.

 

Step 5: Do the Math Carefully

 

When the case involves quantitative analysis, lay out your approach before calculating. This is good practice in any case interview math situation, but it is especially important at Cornerstone Research because the numbers often have legal implications. Talk through each step out loud so the interviewer can follow your reasoning.

 

Step 6: State Your Conclusion and Tie It Back

 

Summarize your findings clearly. What did the analysis show? What is the implication for the case? If you were advising the legal team, what would you tell them? Cornerstone Research interviewers want to see that you can connect your analytical work to a practical conclusion.

 

What Are Cornerstone Research Case Interview Examples?

 

Cornerstone Research publishes two practice case examples on their website. These are the best resources for understanding what your actual interview will look like. Here is how to approach each one:

 

Case Example 1: Securities Fraud Damages (Zilo Corporation)

 

The scenario: Zilo Corporation went public at $20 per share and its stock rose to over $60. After losing two major customers (who together accounted for 40% of sales), the stock fell to $16. Shareholders sued, alleging the officers knew about the customer losses months before announcing them. The plaintiffs claimed $40 per share in damages.

 

The core analytical question: Is the plaintiffs' $40 per share damages figure accurate? Or does it overstate the impact of the alleged misconduct by attributing unrelated stock price movements to the fraud?

 

How to approach it: The key insight is that the stock price moved for many reasons during the class period, not just the alleged misconduct. Economy-wide events (reflected in the S&P 500), industry trends (reflected in peer company stocks), and other Zilo-specific news all affected the price. A regression analysis trained on pre-period data can predict what Zilo's stock would have done absent the misconduct.

 

The conclusion: The case team found that most of the stock price movements were explained by market and industry factors. After controlling for these, only $3 of the $40 decline could potentially be attributed to the alleged misconduct. This is a massive reduction from the plaintiffs' claim.

 

Case Example 2: Intellectual Property Lost Profits (ACME vs. Duff)

 

The scenario: A court ruled that Duff Products unlawfully used ACME Manufacturing's patented techniques. ACME's revenues declined during the infringement period, and ACME claimed hundreds of millions in lost profits.

 

The core analytical question: Did ACME actually lose profits because of Duff's infringement? Or did something else cause ACME's revenue to decline?

 

How to approach it: First, check whether Duff and ACME even compete for the same customers. If they sell through different channels to different customer types, it is unlikely that Duff stole ACME's customers. Second, look for alternative explanations for ACME's declining revenue, such as new technology entering the market.

 

The conclusion: The analysis showed that ACME sold to large institutions while Duff sold to retail consumers through entirely different channels. Duff expanded the market rather than taking ACME's customers. Meanwhile, ACME's revenue declined because a new technology made its products obsolete. After deducting costs, ACME's actual lost profits from the infringement were minimal.

 

Additional Practice Scenarios

 

Based on candidate reports and the types of cases Cornerstone Research handles, here are additional scenarios you might encounter:

 

• A tech company is accused of monopolistic practices in online advertising. Analyze market structure, barriers to entry, and market power.

 

• Several large retailers are accused of price-fixing. Evaluate whether common pricing patterns reflect collusion or independent market responses.

 

• A pharmaceutical company faces a patent infringement lawsuit. Estimate potential damages using lost profits and reasonable royalty methodologies.

 

• A manufacturing company faces environmental contamination claims. Assess the financial impact of cleanup costs, fines, and reputational damage on valuation.

 

• A private equity firm considers acquiring a chain of luxury hotels. Conduct due diligence on financial performance, competitive positioning, and potential synergies.

 

What Behavioral Questions Does Cornerstone Research Ask?

 

Behavioral and fit questions make up a significant portion of every Cornerstone Research interview. According to one of the firm's own Senior Managers, "interviews are a two-way street." According to a Manager at the firm, candidates should prepare for behavioral components "as much or even more than the case element." Here are the most common behavioral interview questions to expect:

 

• Why economic consulting? This is the number one question. Have a clear answer for why you find the intersection of economics and law compelling, and why you prefer this over management consulting, investment banking, or academia.

 

• Why Cornerstone Research? Be specific. Reference their practice areas, their model of working with academic experts, or something you learned from a networking event or the firm's website.

 

• Describe a time you used data to solve a problem. This is your chance to show analytical thinking. Choose an example where you gathered data, analyzed it, and drew a meaningful conclusion.

 

• Tell me about a time you worked on a team. Cornerstone Research values collaboration. A Principal at the firm has said they look for candidates who demonstrate "collaboration, conflict management, and mentorship."

 

• Walk me through your resume / research. For PhD and graduate-level candidates, expect detailed questions about your academic research and its practical implications. Be prepared to explain your work to a non-specialist audience.

 

If you want to be fully prepared for 98% of behavioral interview questions in just a few hours, check out my Fit Interview Course.

 

What Are the Best Tips for Cornerstone Research Case Interviews?

 

Study Cornerstone Research's published case examples. The two cases on Cornerstone Research's website (the Zilo securities case and the ACME/Duff IP case) are the closest thing to your actual interview. Multiple candidates have reported that interview cases follow a similar structure.

 

Think causation, not correlation. In almost every Cornerstone Research case, the central question is whether A actually caused B. Train yourself to immediately ask: "What else could explain this outcome?" This one habit will set you apart from most candidates.

 

Review basic regression concepts. You will not need to build a model, but you should understand what independent and dependent variables are, what it means for a result to be statistically significant, and why controlling for external factors matters. This comes up especially in final-round interviews.

 

Listen to your interviewer carefully. Cornerstone Research's own tip page says, "Listen to your interviewers. They want to help you stay on track!" This is not empty advice. CR interviewers actively guide you through the case. If they ask a leading question, follow the thread.

 

Talk through your reasoning out loud. Silent thinking is a red flag in any case interview, but it is especially problematic at Cornerstone Research where the interviewer needs to assess your thought process and comprehension skills. Explain what you are thinking and why.

 

Start preparing at least two to four weeks early. Cornerstone Research cases require a different skill set than standard consulting cases. Even if you have done dozens of McKinsey-style practice cases, you still need time to build comfort with economic reasoning and litigation-style analysis.

 

Practice with a partner. Casing with a partner is the best way to simulate the real interview. Have your partner guide you through one of the published Cornerstone Research cases and provide feedback on your reasoning and communication. If you want expert-level feedback, my Interview Coaching pairs you with me for 1-on-1 practice sessions.

 

How Much Do Cornerstone Research Analysts Make?

 

According to Glassdoor data from over 590 salary reports, Cornerstone Research analysts earn an estimated average base salary of approximately $108,000 per year. The typical range falls between $83,000 and $143,000 depending on location and experience level. Including bonuses, total compensation can be higher.

 

Cornerstone Research analysts benefit from a structured career path with clear promotion milestones. The firm invests in training programs, pairs each analyst with a senior advisor, and offers exposure to high-profile litigation cases. Common exit opportunities include graduate school (MBA, JD, or PhD programs), roles in law and finance, and advancement within the economic consulting space.

 

Frequently Asked Questions

 

Are Cornerstone Research Case Interviews Interviewer-Led or Candidate-Led?

 

Cornerstone Research case interviews are generally interviewer-led. The interviewer walks you through the case, presents data at each stage, and asks targeted questions. You are expected to think through each question out loud and demonstrate your reasoning, but you do not need to drive the entire case yourself.

 

Do I Need an Economics Background to Pass a Cornerstone Research Case Interview?

 

No. Cornerstone Research recruits from a wide range of academic backgrounds and designs cases to be accessible to all candidates. However, having a basic understanding of concepts like causation versus correlation, regression analysis at a high level, and how to interpret data will give you a meaningful advantage. You can learn these concepts in a few hours of focused study.

 

How Many Case Interviews Will I Have at Cornerstone Research?

 

You will have a case in each interview session. In the first round, that means two cases (one per 30-minute interview). In the final round, you will face cases in most of your four 45-minute interviews, though the final interview with a principal may be primarily behavioral. In total, expect five to six cases across both rounds.

 

How Long Does the Cornerstone Research Hiring Process Take?

 

According to Glassdoor data, the Cornerstone Research hiring process takes an average of 17 days from initial application to offer. Some candidates report hearing back within two business days after the first round, while the wait after the final round can be up to seven business days.

 

Does Cornerstone Research Provide Practice Cases?

 

Yes. Cornerstone Research publishes two official practice cases on their careers page: a securities fraud case involving stock price damages estimation and an intellectual property case involving lost profits analysis. These are the best resources for understanding the format and difficulty of actual interview cases.

 

What Is the Difference Between Cornerstone Research and Management Consulting Firms?

 

Cornerstone Research is an economic consulting firm specializing in litigation support and expert testimony, not a management consulting firm. While firms like McKinsey, BCG, and Bain help clients with business strategy, Cornerstone Research provides financial and economic analysis for legal proceedings. The work involves partnering with academic experts from top universities to support attorneys in cases involving antitrust, securities, intellectual property, and other areas.

 

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