Earlier quoted context omitted.
There have been studies and the vast majority of millionaires in the United States are still self made, whereas Europe is largely old money.
That is true only for UK. Simply because in rest of EU there is no way to be 'old money' due to world wars and/or Communism where old money lost everything.
[1] http://deredactie.be/cm/vrtnieuws.english/News/1.2362216#