Khan Academy
Khan Academy: The Structure of Costs in the Long Run
In the long run, you can change anything about your business, so all costs are variable.
Khan Academy
Khan Academy: The Economics of Pollution
Pollution is an example of a negative externality. Despite the gradual reduction in emissions from fossil fuels, many important environmental issues remain. Along with the still-high levels of air and water pollution, other issues...
Khan Academy
Khan Academy: Interpreting the Aggregate Demand/aggregate Supply Model
In order for a macroeconomic model to be useful, it needs to show what determines total supply or total demand for the economy and how total demand and total supply interact at the macroeconomic level. This model is called the aggregate...
Khan Academy
Khan Academy: How Perfectly Competitive Firms Make Output Decisions
See examples of how perfectly competitive firms decide how much to produce.
Khan Academy
Khan Academy: Efficiency in Perfectly Competitive Markets
Why are perfectly competitive markets efficient?
Khan Academy
Khan Academy: Positive Externalities of Innovation
Innovation often benefits many people, not just the person or company that innovated.