# 10.8: Why It Matters- Perfect Competition

- Page ID
- 48413

## Why analyze a firm’s decisions under conditions of perfect competition?

This module is the second in the theory of the firm and the first of three modules examining models of market structure. Market structure means, in a nutshell, how competitive or monopolistic is a particular industry. It should be clear that market structure influences how firms behave. Figure 1 shows the full spectrum of types of markets, from perfect competition with many firms, to a monopoly, with one firm controlling the marketplace.

We start by looking at the ideal model of perfect competition. This model is a bit of a head scratcher since there are, actually, very few examples of industries like this in the real world. Why then do we study it? Here’s a question for you to think about as you move through the module: what’s so perfect about perfect competition? Hint: the model has certain ideal features that you will learn and apply to the other markets.

Have you ever noticed that all the tomatoes of the same type in a farmer’s market cost about the same price? The same thing is true of roadside vegetable stands in the countryside. If one stall in a locality has tomatoes for $3 per pound, they all do. Now the price may change from week to week, but it’s always the same across the different vendors in the market. You will soon learn why this is.

There are more similarities than differences between this module and the others that follow it. What you learn in this module will carry over and help you understand the next ones, so the more effort you put into learning this one, the easier the next three modules will be.

## Contributors and Attributions

- Why It Matters: Perfect Competition.
**Authored by**: Steven Greenlaw and Lumen Learning.**License**:*CC BY: Attribution*

- Introduction to Production, Costs, and Industry Structure.
**Authored by**: OpenStax College.**Located at**: https://cnx.org/contents/XAl2LLVA@7.16:SlmDF6TE@7/Introduction-to-Production-Cos.**License**:*CC BY: Attribution*.**License Terms**: Download for free at http://cnx.org/contents/bc498e1f-efe...569ad09a82@4.4