The source classifies industries into three types based on how costs change as the industry expands. What are these three types?

1. The source categorizes industries by what happens to production costs as demand and the industry expand. 2. A constant cost industry sees no change in production costs as it expands. 3. An increasing cost industry sees production costs rise, and a decreasing cost industry sees them fall. 4. Market structure types like monopoly and oligopoly are a separate classification the source mentions elsewhere, not this cost-based one. _Source: OpenStax Principles of Microeconomics for AP Courses (CC BY 4.0), Ch 8 "Perfect Competition", section 8.3 | Entry and Exit Decisions in the Long Run_