Skip to main content
Fennie
HomeGet Started
Harvard
Economics
4 credits

Harvard EC 10A: Principles of Economics: Microeconomics

Ec 10A is the fall-semester microeconomics half of Harvard's famous Principles of Economics sequence — historically one of the largest courses at the college. It covers supply and demand, markets, firm behavior, and policy applications, and is the entry point to the economics concentration.

Fennie is independent and not affiliated with Harvard University. This is an unofficial study guide.

Build my EC 10A study plan

What makes it hard

The content is standard intro micro, but exams reward precise graphical and quantitative reasoning, and the course's scale means grading is systematic — no partial credit for vibes. Students who treat it as a reading course get caught by problem-set-style exam questions on elasticity, surplus, and policy analysis.

What you'll cover

  • • Supply, demand, and equilibrium
  • • Elasticity
  • • Consumer and producer theory
  • • Market efficiency and welfare
  • • Taxes, externalities, and policy
  • • Market structures

The EC 10A study guide

How to study for Harvard EC 10A, step by step.

  1. 1

    Do every pset thoroughly, not minimally

    Ec 10A's exams are predictable for students who treat each problem set as exam rehearsal. Work every part, and rework the ones you needed help on a few days later.

  2. 2

    Make graph mechanics automatic

    Drawing, shifting, and labeling supply-demand and welfare diagrams should cost zero conscious effort by midterm. The exams grade systematically — no partial credit for vibes — so precision in the mechanics is everything.

  3. 3

    Use section as a feedback loop, not a recap

    Arrive with the week's problems attempted and your specific confusions identified. Section is where the gap between your reasoning and the rubric's expectations gets closed.

  4. 4

    Drill the quantitative question styles

    Elasticity computations, surplus areas, and tax-incidence numbers recur in exam after exam. Practice them under time pressure until the setups are instant.

  5. 5

    Put the pset rhythm on Fennie

    Upload the Ec 10A syllabus and Fennie's Daily Plan paces problem sets and section prep week by week toward each exam, with quantitative practice questions generated from your actual course materials. Free to start.

    Start my EC 10A plan free

How Fennie helps with EC 10A

Daily Plans pace Ec 10A's weekly problem sets and section prep so graph mechanics become automatic before exams. Chat through a welfare-analysis problem when the surplus regions blur, and generate practice questions in the quantitative style the exams use.

FAQ

Is Ec 10A hard?

It's accessible but precise — exam questions are quantitative and graphical, not essay-style. Students who do every pset thoroughly find exams predictable.

Do I need Ec 10A for the economics concentration?

Ec 10A and 10B (or equivalent placement) are the standard gateway into the Harvard economics concentration and prerequisites for intermediate theory.

Should I take Ec 10A with no economics background?

Yes — it assumes none. Comfort with graphs and basic algebra is the only real prerequisite.

Pass EC 10A with a plan, not a cram

Upload your EC 10A materials and Fennie generates a Daily Plan paced to your deadline — plus chat, flashcards, and quizzes built from the actual course content.

Get started free

More Harvard courses

EC 10B — Principles of Economics: Macroeconomics

Ec 10B is the spring macroeconomics half of Harvard's principles sequence: GDP, inflation, unemployment, growth, monetary and fiscal policy, and international economics. Together with Ec 10A it forms the foundation for all further economics coursework at Harvard.

EC 1010A — Intermediate Microeconomics

Ec 1010A is Harvard's intermediate microeconomic theory course — consumer and producer optimization, equilibrium, market failures, and welfare — and the first of the two theory pillars of the economics concentration after Ec 10. It's where economics goes from graphs to calculus.

EC 1010B — Intermediate Macroeconomics

Ec 1010B is Harvard's intermediate macroeconomic theory course — growth, fluctuations, unemployment, inflation, and the analytics of fiscal and monetary policy — the second theory pillar of the economics concentration after Ec 10. Models that Ec 10B sketched verbally get full mathematical treatment here.