THE STORY OF YAHOO

 1998: Yahoo refuses to buy Google for 1 million dollars
2002: Yahoo tries to buy Google for 3 billion USD, Google says "Give us $5 billion", Yahoo says no
2008: Yahoo refuses to be sold to Microsoft for $40 billion dollars
2016: Yahoo sold for $4.8 billion to Verizon

Lesson? I really don't know what to make of it.