Southern New Hampshire University

ECO 201: Microeconomics

A study guide to SNHU's introductory microeconomics course on supply and demand, elasticity, costs and market structures.

Updated October 2026 · 5 min read

ECO 201 is an undergraduate course at Southern New Hampshire University (SNHU). The catalog describes it as an introductory course giving a foundation in the principles of microeconomics.

It covers supply and demand, market equilibrium, price elasticity, economic costs and market structures, using authentic examples and activities so that students understand how consumers and producers make decisions in a market economy.

The subject mixes graphs, simple calculations and verbal explanation. Students often lose marks not on the arithmetic but on explaining why a curve shifts or what a result implies.

Course at a Glance

ItemDetails
UniversitySouthern New Hampshire University (SNHU)
CourseECO 201, Microeconomics
Credits3
LevelUndergraduate
DeliveryOffered online and on campus (per the catalog)
PrerequisiteNone listed in the catalog entry

What ECO 201 Covers

Topic (catalog wording)What you do with it
Supply and demandExplain what moves each curve and what a shift does to price and quantity
Market equilibriumFind the price and quantity where the market clears
Price elasticityMeasure how responsive quantity is to price
Economic costsDistinguish fixed, variable, marginal and opportunity costs
Market structuresCompare competition, monopoly and other structures

Key Concepts Explained

Shifts Versus Movements

A change in the price of the good itself moves you along a curve. A change in something else, such as income, tastes or input costs, shifts the whole curve. Mixing these up is the most frequent error.

Illustration: Demand is Qd = 100 - 2P and supply is Qs = 20 + 2P. Setting them equal gives 100 - 2P = 20 + 2P, so 4P = 80 and P = 20. Quantity is 100 - 40 = 60. If a cost fall adds 20 units at every price, supply becomes Qs = 40 + 2P, so 4P = 60, P = 15 and Q = 70. Price falls and quantity rises.

Price Elasticity of Demand

Elasticity is the percentage change in quantity demanded divided by the percentage change in price. If it is greater than one in absolute value, demand is elastic and a price rise cuts revenue; if less than one, demand is inelastic.

Illustration: A price rise of 10% cuts quantity by 5%. Elasticity is 5 / 10 = 0.5 in absolute value, so demand is inelastic, and the price rise increases total revenue.

Costs and Market Structure

Firms decide output by comparing marginal cost with marginal revenue. In perfect competition firms take the price as given. A monopoly sets price knowing it faces the whole market demand, which usually means higher prices and lower output.

Typical Assignments and How to Approach Them

Check your course materials for the exact assignments. Courses like this typically combine problem sets, short written applications and a project or case.

Task typeWhat it testsHow to approach it
Supply and demand problemsGraph and algebra skillsDraw the graph, mark the shift and state the new equilibrium in words
Elasticity calculationsInterpretationShow the formula, the number and what it means for revenue
Cost analysisDecision logicSeparate fixed from variable cost and use marginal reasoning
Market structure applicationComparisonDescribe features, then the likely price and output result

A Method for Any Graph Question

Using the same steps every time helps you avoid slips. First identify the market and the curves. Next decide what changed and whether it affects supply or demand. Then shift the right curve in the right direction and read the new equilibrium. Finally, describe the result in a sentence.

EventCurve affectedDirectionResult for price and quantity
Consumer incomes rise (normal good)DemandRightPrice up, quantity up
Input costs fallSupplyRightPrice down, quantity up
A new tax on sellersSupplyLeftPrice up, quantity down

A Study Approach by Topic

Begin with supply and demand and make sure you can draw, label and shift the curves quickly. Everything else builds on it. Next add elasticity, practicing both the calculation and the sentence that explains what the number means for revenue.

Move on to costs, learning the difference between fixed, variable, marginal and opportunity cost and how a firm uses marginal cost to choose output.

Finish with market structures by making a one-page comparison of the features of each, including number of firms, product type, entry barriers and typical price outcomes. Revisit earlier topics weekly with a few practice questions so the early material stays fresh.

Where Students Get Stuck

Study Tips for ECO 201

How We Help with ECO 201

Send the question, any data and the rubric. An economics tutor can prepare a worked solution, explain graphs and formulas step by step, or review your own answer. The work is study support; submit your own work under SNHU's academic integrity policy.

GradeEssays is independent of Southern New Hampshire University. Orders are written from scratch, include free revisions within the scope of your original request, and are refunded in full if late. See also our finance assignment help guide.

Make Sense of Your ECO 201 Work

Share the assignment and your draft. We explain the method and the graph logic so you can check your own answers.

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Frequently Asked Questions

How many credits is ECO 201?

The catalog lists 3 credits.

Is there a prerequisite?

The catalog entry lists none.

Can I take it online?

The catalog says it is offered online and on campus.

What topics does it cover?

Supply and demand, market equilibrium, price elasticity, economic costs and market structures.

How is ECO 201 different from ECO 202?

ECO 201 focuses on individual markets, consumers and firms. ECO 202 is the macroeconomics course.

Can you check my graph work?

Yes. We review the curves, shifts and explanations and show what to correct.