I have a theory on this. . .
Financial stress often leads to drinking as a way to forget said stress. It also means you are limited on funds for buying alcohol, so you can only afford the cheap stuff. The cheap stuff often has numerous issues (namely high sugars to cover horrible flavors as well as added alcohol) that lead to hangovers.
The guy who just got laid off isn't out drinking a bottle of Pappy Van Winkle. . . he's hitting that plastic bottle of Kentucky Gentleman.