4 pieces
Explorable essays
Adverse selection, tax incidence, discounting and repeated cooperation, each with a working model in the page.
Lemons
Adverse selection, run as a used car market. Set the spread of quality and how much buyers can see.
Incidence
Drag the supply and demand curves, set a tax, and watch the burden split between the two sides.
Discounting
Move the rate and watch a fixed benefit in a distant year lose almost all of its present value.
Cooperation
The repeated prisoner's dilemma. Pick the strategies, set the payoffs and the chance the game continues.