LSESU Essay vs John Locke vs Marshall Society: Which Economics Competition (2026)

For ambitious economics students in 2026, the three best-known essay competitions reward different things. The LSESU Economics Society Essay Competition (free, set by LSE faculty, 1,500 words, 1 September deadline) rewards a tight argued answer to one of five set questions. The John Locke Institute prize (2,000 words, 31 May deadline) rewards open-ended originality and offers large programme scholarships. The Marshall Society at Cambridge rewards a shorter, sharply reasoned essay. Pick by format, deadline and what each judges.

Why compare these three at all?

If you are a high-school student aiming at Economics, PPE or a related degree, these three are the names admissions readers actually recognise. They are all free or low-cost, open internationally, and judged on writing rather than on a test score — which is exactly why students confuse them and often enter the wrong one for their goals. They differ in three ways that matter: how long the essay is, when it is due, and what the judges are really rewarding. Get those three right and you stop wasting months on a format that does not suit you. For background on the one this site specialises in, see our explainer on what the LSESU Essay Competition is.

A quick honesty note before the comparison: our tutoring track record in this space is in the John Locke Institute competition, where students we have worked with have won. We have not claimed wins in the LSESU competition, and we never relabel a John Locke result as an LSESU one. We flag this so you can read the rest of this guide knowing where our first-hand experience is — and where we are simply reporting published rules.

The three competitions, side by side

The table below is the fastest way to see the differences. Every figure here is drawn from each competition's most recent published cycle; because organisers update rules each year, treat the table as a starting map and confirm the exact 2026 numbers on the official pages before you commit.

Two contrasts jump out. First, prize structure: John Locke offers large scholarships toward its own programmes, while LSESU and Marshall offer modest cash plus prestige and certificates. If a cash scholarship is the goal, John Locke is in a different league; if a clean, faculty-linked credential is the goal, LSESU and Marshall compete on prestige, not money. Second, AI policy: LSESU forbids AI-generated content outright, whereas Marshall permits declared AI use — a real, practical difference in how you are allowed to work.

What each one actually rewards

Word limits and dates are easy to look up. The harder question is what kind of essay wins — and here the three diverge sharply.

LSESU rewards disciplined argument on a faculty question. Because the five prompts are written by LSE Economics academics and judged against a published 100-point rubric, the winning move is not to be flashy — it is to answer the precise question asked, support every claim with evidence, and reference cleanly. Originality counts, but it is originality in service of the question, not a free-roaming essay. If you want to see how the marks are split, we break it down in our guide to the 100-point rubric, and the live 2026 prompts and criteria are covered in this guide to the 2026 questions and rubric.

John Locke rewards intellectual risk. Its questions are deliberately open and provocative, and the judging language prizes “originality” and “persuasive force.” A John Locke winner often takes a contrarian or unexpected line and defends it with rigour over a longer 2,000-word canvas. This is genuinely different from LSESU's tighter brief — and it is the format where our own students have won, so we can say from experience that the bar is on bold-but-defensible thinking, not safe summary.

Marshall rewards economic reasoning in compact form. As the essay competition of Cambridge's economics society, it leans toward clean theoretical or applied reasoning expressed efficiently — a shorter word limit forces precision. Winning essays are published in the society's magazine, The Dismal Scientist, which tells you the house taste: tight, publishable, idea-forward writing.

How the timing actually plays out across a year

A point students miss: these deadlines do not clash, so you can realistically enter more than one in a single year if you plan backwards. John Locke submissions close on 31 May 2026, near the end of the spring exam period. The LSESU and Marshall deadlines fall later, in late August / early September, in the summer break. That sequencing means a disciplined student could draft a John Locke essay through spring, then turn a related body of reading into an LSESU or Marshall entry over the summer — reusing research, not the essay itself. The catch is that each competition wants a different shape of essay, so “recycling” must stop at the research stage; the argument has to be rebuilt to each brief and word limit.

For students based in China and Asia, there is one more scheduling detail worth pinning down early. The LSESU deadline of 1 September 2026, 23:59 GMT+1 falls at 06:59 Beijing time on 2 September — easy to misread if you assume a local cut-off. Whichever competitions you target, convert every deadline to your own timezone the moment you commit, and confirm it against the official page rather than a third-party summary.

A realistic recommendation

There is no single “best” competition — only the best fit for your goal. If you want the highest-prestige, highest-prize route and you thrive on open, contrarian questions, John Locke is the standout, and it is where we have seen students we coached actually win. If you want a faculty-set, rubric-judged challenge that maps cleanly onto an LSE-style economics application and rewards disciplined argument over a 1,500-word brief, the LSESU Essay Competition is the natural choice — and it is the one this desk knows in most depth. If you want a short, theory-forward piece with a shot at being published by Cambridge's economics society, Marshall fits. Many strong applicants enter two of the three across one year. Whatever you choose, the winning behaviour is the same everywhere: answer the exact question, build the argument with evidence, reference honestly, and never outsource the thinking to a tool that the rules forbid.

Frequently asked questions

Which economics essay competition is hardest to win?
By prize prestige and applicant volume, John Locke is generally the most competitive, with large scholarships and an open, demanding brief. LSESU and Marshall are highly competitive too but reward tighter, set-question essays.

Can I enter LSESU, John Locke and Marshall in the same year?
Yes. John Locke closes around 31 May 2026; LSESU and Marshall fall in late August / early September. The deadlines do not clash, though each wants a differently shaped essay, so confirm every date officially.

Do these competitions allow AI assistance?
Policies differ. LSESU forbids AI-generated content and screens for it; John Locke applies strict originality rules; Marshall permits AI use only if declared. Always check the current rule before you write.

Are you affiliated with John Locke or Marshall?
No. This desk is the official China and Asia partner for the LSESU Essay Competition. We have coached students to wins in the John Locke competition, but we do not run or represent John Locke or Marshall.

Published by the LSESU Essay Competition editorial desk, operated by Hanlin Education (with ASEEDER, the official China and Asia partner) for China-based international-school students. Official rules — including word limits, deadlines, prompts and prizes — are set by each competition and change every year, so always confirm the current details on the official LSESU Economics Society pages and on the John Locke Institute and Marshall Society sites before entering. Any confirmed factual error is corrected within 7 working days.

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