I am starting to work on filling in/updating some of these college economics topics. Students land on the site when they want to get help with their college econ courses. But I plan to include some occasional “improvements” to mainstream thinking. I did not much need to amend mainstream thinking in my first topic, costs of production.

Other things equal, when fixed costs are high, there will be only a few firms. When fixed costs are low, there will tend to be many firms. When the Internet reduced the fixed cost of becoming a publisher, because you no longer need a printing press, the number of providers of written content skyrocketed.