How to Study for Economics Exams: Models, Graphs and the Maths Behind Them

Economics exams test whether you can think with models. A question might describe a new tax on fuel, a central bank raising its policy rate or two firms deciding whether to cut prices, and ask what happens next. To answer, you need to pick the right model, show the effect on a graph or in equations, and explain the mechanism in words. Each of those is a separate skill, and students usually practise only one of them.

The typical pattern is that a student follows the lecture, recognises every graph on the slides and still struggles in the exam, because recognising a supply and demand diagram is very different from drawing the correct one for a new situation. This guide covers how to practise the full chain for microeconomics and macroeconomics modules, the kind taught in the first years of economics and business programmes at universities such as Mannheim, Goethe University, WHU and Frankfurt School.

What do economics exams actually reward?

Question: Why can two students with the same notes get very different economics grades?

Answer: Because marks go to application, not to coverage. Most economics papers mix four task types: numerical problems (find the equilibrium, the optimal bundle, the deadweight loss), derivations (set up and solve an optimisation problem), graphical analysis (show the effect of a shock and label the new equilibrium) and short written explanations (why does this happen, and under what assumptions). Notes contain the content. Grades depend on whether you can perform those four tasks on a scenario you have not seen before.

Before you plan your preparation, go through two or three past papers and estimate how the marks are split across these four types. An intermediate micro exam heavy on Lagrangian optimisation needs a different balance from a macro exam built around policy explanations.

How to study for economics exams: one model, three forms

For each model in your course, make sure you can produce all three forms from memory. The table shows what that means for some standard models. Adjust it to your own syllabus.

How should you practise economics graphs?

Start with a blank page every time. Draw the axes and label them, draw the initial equilibrium, apply the shock, and mark the new equilibrium with the direction of every change. Then compare with the lecture. Most graph errors fall into a few groups: unlabelled or wrongly labelled axes, confusing a shift of a curve with a movement along it, shifting the wrong curve, and drawing a graph that contradicts the written answer next to it.

A good drill is to take one model and run five different shocks through it in a row: an increase in government spending, a tax cut, a rise in money supply, a fall in business confidence and a supply shock. Then mix models, so you also practise choosing which graph a question needs. This is what the exam will ask, and it is much more demanding than redrawing the graph exactly as it appeared on a slide.

How do you get the derivations right?

Question: What is the best way to prepare for optimisation and equilibrium calculations?

Answer: Learn the procedure as a sequence of steps, then practise it on new functions. For a constrained optimisation, the steps are: write the objective and the constraint, set up the Lagrangian, take the first-order conditions, combine them to eliminate the multiplier, and solve with the constraint. Once the procedure is reliable, vary the utility or production function, for example from Cobb-Douglas to perfect complements, where the standard calculus approach no longer applies and you need to reason from the shape of the curves.

After each result, ask whether it makes economic sense. Does demand fall when the price rises? Does a firm with market power produce less than a competitive one? This check catches algebra errors and also trains the intuition the written parts of the exam ask for. The habit of explaining why a result holds is close to what the Dunlosky et al. (2013) review calls elaborative interrogation and self-explanation, both rated as having moderate utility. In the same review, practice testing and distributed practice were rated as having high utility.

Practising the explanation, not just the answer

Written parts of economics exams usually ask for a mechanism. A strong answer reads as a chain: the central bank raises the policy rate, borrowing becomes more expensive, investment and interest-sensitive consumption fall, aggregate demand falls, and output and inflation decline in the short run. A weak answer states the conclusion and skips the links. Examiners often award marks for each link.

Two methods work well here. The Feynman technique asks you to explain a mechanism in simple words, which quickly shows where a step is missing. The blurting method asks you to write everything you know about a topic from memory and then check it against the lecture, which works well for longer policy questions. Both are forms of active recall. In Roediger and Karpicke (2006), students who practised recalling a text remembered more of it a week later than students who reread it.

Common mistakes in economics exams

• Mixing up nominal and real values, for example nominal and real interest rates in a macro question.
• Ignoring the time horizon. Many models give different answers in the short run and the long run, and questions often ask for both.
• Using a model outside its assumptions, such as applying perfect competition to a market with few firms.
• Reporting a number without units or without saying what it means for the question.
• Writing a correct conclusion that contradicts the graph drawn next to it.

Keep a short list of the mistakes you make in practice and read it before each past paper. The list is usually short, and the same items tend to repeat.

Using past papers in economics

Past papers show you the style of each chair: whether the micro exam is mostly calculus, whether the macro exam expects long explanations, and which models come up year after year. Work through them in this order. First, read several papers without solving them and list the recurring question types. Second, solve one paper with notes, writing full answers including graphs. Third, solve the rest under time pressure without notes. The guide on how to use practice exams covers timing and marking.

When you mark your answers, check four things separately: was the model correct, was the graph correct and labelled, was the maths correct, and did the explanation include every step of the mechanism? A student who loses marks mainly on explanations needs a different final week from one who loses marks on algebra. If you study at Goethe University, the Goethe University exam study guide covers the exam period there in more detail.

FAQ: Studying for economics exams