The Friday File: The world’s most expensive stock (if you can call it that) chocolate bar that isn’t coated in edible 24-karat gold leaf, that doesn’t come with a rare gold coin, and that doesn’t weigh over 100 lbs, is a boundary-pushing 2015 vintage, Ecuador-based, chocolate bar from To’ak that costs just $355 for a 50-gram, almost 2-oz, bar. Run to buy one. In 2014 just 574 were made.