Five-minute explainers, one per topic, with a few quick checks at the end. Finish one for +20 points plus +5 for each check you get right. Come back any time to review (+5, once a day).
Unit 3: Production, Cost, and the Perfect Competition Model
3.1The production function5 min · 3 checks3.2Short-run costs, part 1: building the cost table8 min · 3 checks3.2Short-run costs, part 2: the curves and why MC falls, then rises7 min · 3 checks3.3Long-run costs and economies of scale5 min · 3 checks3.4Accounting vs economic profit4 min · 3 checks3.5Profit maximization: MR = MC5 min · 3 checks3.6Shut down or keep going? Entry and exit6 min · 3 checks3.7Perfect competition: the side-by-side graph6 min · 3 checks
More units are coming. Each topic's lesson also appears next to its Practice button.