Warren Buffett's 'most gruesome mistake' was buying Dexter Shoe. Here's the story of his $9 billion error.

**

· *Warren Buffett's "most gruesome mistake" was buying Dexter Shoe in 1993, a Maine shoemaker that soon collapsed under pressure from cheap foreign imports.*
· *The famed investor paid for Dexter with 25,203 Class A shares in Berkshire Hathaway, worth about $8.7 billion today.*
· *"I gave away 1.6% of a wonderful...