We owe a debt of thanks today to our learned money-manager friend from Lake Tahoe, Rich Cash, for his labyrinthine treatise on the origins of Friday the 13^th.  Here’s Rich, and we would encourage you to follow the links he has provided wherever they lead (including this one, to subscribe to his excellent service): 

I had a financial friend who was a triskaidekaphobe. He did not like the Friday the 13th film franchise genre, with 12 films now. (Will the 13th release be unlucky?) On Fridays the 13th, my friend ran and hid, fearing the end of his luck, if not his portfolio. If a month begins on Sunday, then there is a Friday the 13th. There may be from one to three Friday the 13ths a year. However, this is the last one until 2015. Will this one be unlucky for the » Read the full article