Great simulation (on Quartz) for students to see the futility of trying to time the market, which is the belief that you can make good decisions about when to get out of the market (if you think it is overvalued) and to get back in (when you think it is undervalued). I created this two-page mini-activity to guide your students through the game.
This simulation uses prices from the S&P500 for a ten year period (this ten year period changes every time you play the game too!) which unfold on the line graph at the rate of about one year of data every 7-10 seconds. Here is a screenshot after seven years elapsed (note the talking head on the left which provides tempting advice as the game unfolds).
Here is a sample output after the game is completed (total time per game play is about one minute):