Almost 90 years have passed since the beginning of the Great Depression and yet most of us are still unclear on what caused America’s greatest economic collapse. The causes and precursors plex, of course, but there are a few factors that we should know about. In this brief video, economist Alex Tabbarok provides one of the best overviews of what exactly occurred during this troubling period in economic history.

(If you find the pace of the videos too slow, I’d mend watching them at 1.5 to 2 times the speed. You can adjust the speed at which the video plays by clicking on “Settings” (the gear symbol) and changing “Speed” from normal to 1.25, 1.5 or 2.)