Buried in the odd story of the death of Eva Rausing is some background on the genesis of the billionaire’s wealth. Eva married Hans Kristian Rausing, an heir to the Tetra Pak fortune. (Tetra Pak’s are recyclable, foil-lined cartons popular in Europe for storing liquids.) Reuters explained:

Hans Kristian’s Swedish grandfather Ruben invented the now ubiquitous foil-lined drinks carton after his wife complained about heavy glass milk bottles.

Buried business lesson: People are willing to pay you for solving their problems. In this case, a problem as simple as a heavy milk container.