"Sounds great! So if I am running a $10 billion institutional portfolio how much of it should be in Legos?
">In one extreme case, a kit for Star Wars Darth Revan that retailed in 2014 for $3.99 went for $28.46 on eBay a year later -- a 613 percent premium.
"Uhhhhhhhhhhhhhhh. So the extreme case is making a profit of … $24.47 over a year? I mean, I guess you could buy … a million … of those Darth Revan sets … and … put them somewhere … but … no, I am going to say no, this is not a strategy with institutional capacity. (And you can’t use it as an additional signal in your multifactor general model of what stocks to buy, because they are Legos, not stocks.) I suppose if you are a perverse sort of finance professor though you should be using a factor model to trade Legos in your personal account; let me know—and, more importantly, brag to your students constantly about—how it goes."