Monopolies Are Worse Than We Thought - Bloomberg View
"Economists are increasingly turning their attention to the problem of monopoly.
This doesn’t mean literal monopoly, like when one utility company provides all the power in a city.
It refers to market concentration in general -- when an industry goes from having 20 players to having only 10, or when the four biggest companies in an industry start taking a bigger and bigger share of sales.
This sort of creeping oligopoly acts much like a literal monopoly -- it raises prices, limits market size and tends to make the economy less efficient.