Other
South Western Learning: Econ News: Comparative Statics: Perfect Competition
This site offers economics-based newspaper headlines and asks follow-up questions based on supply and demand in a perfectly competitive market.
Tutor2u
Tutor2u: Perfect Competition Introduction
This website describes the conditions of a "perfectly competitive" market structure, and the obstacles that the individual firm in this market will face.
Khan Academy
Khan Academy: Increasing, Decreasing, and Constant Cost Industies
Practice what you have learned about the effect of economies of scale on cost and prices in this exercise.
Curated OER
Perfect Competition
This site shows costs curves for a firm in a perfectly competitive market, and has an interactive graph to show what their profit margin is at various levels of production.