Charles River Associates Case Interview 2026: Show Your Math

Why an economics firm runs a different case interview

Start with who pays. CRA's essential facts page says clients include 88% of the Fortune 100 and 98% of the Am Law 100. It says the firm has over 1,000 consultants across more than 20 offices, and that it started in 1965 near the Charles River in Boston.

One more number on that page matters more than the rest. More than 82% of senior staff hold advanced degrees, and more than 35% hold PhDs. The person running your case is likely to be a trained economist.

The careers FAQ answers a question that tells you the rest. Asked whether CRA staff are attorneys, the firm answers no, and adds that in many of its cases the clients are attorneys. So the output of a project is evidence. Evidence gets read by an opposing expert whose job is to find the error in it.

That is why the interview leans on arithmetic you can defend rather than on a tidy shape. A strategy case rewards a fast, clean split of a business problem. A CRA case is closer to a question an economist would be asked under oath: what would have happened without the conduct, and how do you know?

The students and recent graduates page lists what an entry-level hire does. Two items on that list are worth reading twice. One is executing economic, financial and strategic analysis in a project-based environment. The other is ensuring reliability of analysis via peer review. Somebody checks your work, every time, and the interview is a small rehearsal of that.

The case interview brief Charles River publishes

The prepare to apply and interview page hides its best content inside collapsed tabs. Open the one marked case interview and the firm describes the exercise in its own words.

It says the case is designed to test how you approach a problem. It says there is usually no single correct answer, and that guestimations are common. It then names four things it looks for: how you react to situations with limited information, how you apply logic and reasoning, what data you draw on, and how you communicate to bring the interviewer along with your thinking.

The last sentence is the operative one. Expect the interviewer to ask questions to test your thinking, so be prepared to explain how you came to your answer and show your math.

Read those two claims together. No single correct answer means the number is not the grade. Show your math means the number still has to exist, out loud, in steps somebody else can audit. A candidate who announces a range without saying how it was built has failed both halves at once.

The same tab carries a small piece of etiquette that costs nothing to follow. Ask questions about the case study during the interview. Save questions about the role and about CRA for the end. A polite opening question about the firm spends the minute the interviewer had set aside for the problem, and the firm has told you where to put it instead.

One practical translation. When you hit an assumption you cannot source, say the assumption, say the direction it biases your answer, and carry on. That is what showing your math means when the data is missing.

Three more interview styles the firm names

The same page lists four styles in total, and writes that different styles may include them. The verb is may. Which of the four you sit depends on the office and the practice.

The assessment line deserves attention because of the word writing. Numeracy and critical thinking are ordinary graduate test content. A written component is the part worth rehearsing, because it is the one a candidate is least likely to have sat before. CRA's advice on it is plain: read the instructions fully, because simple errors come from skipping them, and keep a watch to pace yourself.

The firm publishes no vendor name, no duration and no passing score for that assessment, so anyone quoting you one did not get it from CRA.

The group exercise is the easiest to prepare for and the one candidates neglect. The firm says it is watching how you speak to others and how you listen. In practice that means yielding the floor once you have made a point, and building on somebody else's idea by name.

The page also covers logistics per format. For an in-person interview, arrive no more than 10 minutes early. For a virtual one, join 5 to 10 minutes ahead, test the software beforehand, and keep the background simple, with a wall behind you if possible.

Two entry doors, two piles of paperwork

CRA runs two graduate campaigns with different titles and different submissions. Conflating them is the error we saw most often in the pages we read about this firm.

The careers FAQ says it plainly for anyone in between: those with an advanced degree should typically apply at the Consulting Associate level and above.

The writing sample is the part to plan around. The undergraduate posting asks for a sole-authored piece of existing work, a class paper, thesis, internship output or work product, carrying your commentary on a quantitative analysis. That is a document you cannot write the night before. It is also the clearest signal of what CRA sells, since the firm's deliverable is a written, defensible argument about numbers.

The same posting says an honors thesis, research apprenticeship or research seminar is highly desired, and lists Excel, Stata, R, Python, SQL and SAS among the tools you may use. If you have run a regression for a class, that experience belongs on page one of your resume.

On format, the firm wants the resume black and white, one page unless you have significant work experience, with coursework and a LinkedIn URL included. Address the cover letter to Hiring Manager or Recruiting Team unless the advertisement says otherwise, and name the practices and offices you want.

A cartel overcharge, worked in dollars

CRA publishes no sample case. So here is one written in the shape of its antitrust work, with the arithmetic done out loud. Treat it as our illustration. The firm has published none of its own.

A regional distributor sues over an alleged price-fixing agreement among chemical additive suppliers. It bought 4.2 million units between 2019 and 2023 at an average price of $12.40, so it spent $52.08 million. In a clean benchmark window before the alleged conduct, the average price was $11.00.

1. The naive answer. $12.40 minus $11.00 is $1.40 per unit. Times 4.2 million units, that is $5.88 million. Say this number out loud, then say why you do not trust it.
2. Adjust the benchmark. Input costs rose 5% between the two windows. Inputs are about 70% of the benchmark price, so $7.70 per unit. A 5% rise on $7.70 is $0.385, which we will carry as $0.39. The but-for price is therefore $11.39 rather than the raw $11.00.
3. Recompute the overcharge. $12.40 minus $11.39 is $1.01 per unit. Times 4.2 million units, that is $4.24 million.
4. Ask who bore it. The distributor resells. If it passed 60% of the increase downstream, it kept 40%. Its own loss is $1.70 million.
5. Stop where the economics stop. Whether that figure gets multiplied is a legal question about the claim. Your model does not produce it. Say so, and do not guess.

The naive answer was $5.88 million. The defensible one was $1.70 million. The gap is $4.18 million, which is 71% of the naive figure, and it came from two questions rather than from harder arithmetic: is the benchmark comparable, and did this plaintiff actually bear the cost? Those two questions are what every firm publishing finance cases in consulting interviews asks, and none of those published cases discounts a cash flow.

That is the move a CRA interviewer is listening for: a stated assumption, a correction, and a number you would still defend after somebody attacked it. Naming a framework does none of that work.

Where a number loses its points

The firm names no marking scheme, so this part is ours and is labeled as ours wherever it appears. Our grader scores a quantitative answer on four dimensions, and the hundred points below are read from the code that does the scoring. CRA has never seen them.

One published account of an interview day

CRA hosts employee accounts on its careers blog. They are first hand and signed. They are also chosen by the employer, so read them as one person's day rather than as the firm's policy.

One account, from an antitrust and competition intern who became an analyst, describes a single day with four interviewers. Two junior staff back to back, then a senior staffer, then a vice president. Each interview ran about 30 minutes, two hours in total.

The two junior interviews covered classes and research the interviewers thought relevant to the practice. The senior interview was the case, and the writer describes walking through a hypothetical for the competition practice that involved generating a pricing model. The line worth keeping: if you are working logically with economic facts to back ideas up, you do not have to arrive at the exact answer. That is the firm's published case paragraph, seen from the chair.

The vice president conversation was about the writer's own independent study and senior thesis. Which is the practical argument for being able to talk about your research for twenty minutes without notes.

A second account, from an analyst hired off cycle from a school CRA does not visit, reports an alumnus forwarding a resume, a remote interview day a week later, and an offer that afternoon. It also reports no gotcha questions, and says undergraduate research is a common theme on first-year analyst resumes.

Two accounts are not a pattern. They are two people, in two practices, at two different times. Treat the timings as illustrative and your invitation email as authoritative. For the behavioral half that both accounts describe, fit practice covers the follow-up probe that breaks a thin story, and practice by firm shows what else exists here.

What CRA withholds

How many interviews, and how long. The FAQ says the second round takes place in an office with several CRA consultants, plus a coffee or a lunch. It never says how many, or how long. The only numbers in circulation come from individual accounts.

Whether the written assessment always happens. The firm writes that different styles may include assessments, and that assessments may include numeracy, writing and critical thinking. Two hedges in one sentence. Prepare for it, and do not assume it.

Who builds that assessment, how long it runs, and what score passes. Nothing published. If a page tells you the vendor, ask where it read that.

Any sample case. CRA publishes none that we could find. It has run a free recruiting session called Case Closed on tackling case-style questions, listed with its other events, but the material is not online.

Acceptance rates and application volumes. Not published, by CRA or by anyone who would know.

If your own experience of this process differs from what is above, tell us what you saw and when, and we will read it back against the firm's pages before changing a word.

What changed on the CRA page

Corrections belong in the open and they belong with a date. The body above says what CRA publishes today; this log says what this page said before.

29 September 2026. Four statements are gone, because none of them came from CRA. That the firm's screening steps could not be verified, when the prepare to apply page describes four interview styles in the firm's own words. That the graduate track opens at one title, when two campaigns run with different titles and different paperwork. That a framework-first habit actively hurts here. And that case math is the highest-yield preparation for this seat, which was our recommendation wearing the firm's voice.

29 September 2026. An arithmetic error in the rubric section. The page said a 40% pass-on rate would move the damages figure by half a million dollars. Redone by hand: at a 40% pass-on rate the distributor keeps 60% of the $4.24 million overcharge, so $2.55 million, which is about $850,000 above the $1.70 million headline. The old figure understated that swing by roughly 40%. The lesson is the one the case itself teaches, since a sensitivity is a second calculation rather than an adjective, and it is wrong until you run it.

29 September 2026. The benchmark step now shows its rounding. A 5% rise on $7.70 is $0.385, and the page carries $0.39 while saying so. And the meta description no longer claims every line here is quoted from CRA's pages, because the worked case, the weights and several readings are ours.