The answer is : The crusades.
The Crusades were a series of religious wars between Christians and Muslims started primarily to secure control of holy sites considered sacred by both groups. In all, eight major Crusade expeditions — varying in size, strength and degree of success — occurred between 1096 and 1291.
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1) I Love Lucy. One of the most successful television series.
2) The Honeymooners. The Honeymooners is a sitcom that starred Jackie Gleason as Ralph Kramden and so many more famous actors.
3) Father Knows Best. Father Knows Best is a radio and television comedy series
A monopolistically competitive market is, by definition, constituted by a large number of firms that compete producing diferenced versions of a product. Such companies are not price-takers and they hold certain degree of power market and of control over the pricing decisions.
However, in a market that comprises so many actors in its supply side, the market power is splitted in many small units and the amount exercised by each is not very strong. Firms operating in this market structure do not have enough power to affect their rivals through their internal decisions and also not enough power to affect potential competitors and to prevent their entrance. They cannot set entry barriers to prevent the entrance of new companies in the market.
