The first clue is one I recall from my tenth-grade teacher, Mr. Duncan, who told our class about how the Roman Empire swept across southern Europe. He recounted in hushed tones how the Romans built hierarchical social and political structures and heavily centralized systems for managing their vast empire. The boundaries between the different classes were strict and legally enforced. Members of different classes even dressed differently. Only the emperor was allowed to wear a purple toga, while senators could wear a white toga with a broad purple stripe along the edge, and equestrians, who
  The first clue is one I recall from my tenth-grade teacher, Mr. Duncan, who told our class about how the Roman Empire swept across southern Europe. He recounted in hushed tones how the Romans built hierarchical social and political structures and heavily centralized systems for managing their vast empire. The boundaries between the different classes were strict and legally enforced. Members of different classes even dressed differently. Only the emperor was allowed to wear a purple toga, while senators could wear a white toga with a broad purple stripe along the edge, and equestrians, who ranked just below the senators, wore togas with a narrow purple stripe. The class of the person was therefore noticeable at first glimpse. So a first historical point is that the countries that fell under the influence of the Roman Empire (including Spain, Italy, and, to a lesser degree, France) tend to be more hierarchical than the rest of Western Europe. Although your Italian boss is unlikely to wear a purple toga, invisible and subtle remnants of these attitudes still remain today. The second clue relates to a much later European empire, one that dominated the northern part of the continent to almost as great an extent as the Roman Empire dominated the south. When you think of the Vikings, you may think of hulking muscular men with long walrus mustaches and hats with horns, riding big ships and waging bloody wars. What you may not know is that the Vikings were surprisingly egalitarian....
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Reasons for different power distance within Europe itself:
1) Egalitarian -> Viking
2) Hierarchical -> Romans (France, Italy, Spain)
3) Protestant -> Egalitarian, Catholic -> Hierarchical