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A glance at the title , people with a little political sensitivity may roughly understand the core topic of this article : the rule of benign interaction between planned economy and market economy , and between public ownership and private ownership -- because only their relationships are those between a father and a son , and it is only between them are there different conflicts involving " human relations , " " rules " and " science , " as well as bloody wrestling between classes , factions and individuals on the basis of morality and interests .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: date, organization, person, geographical social political, national religious political, facility, cardinal, location, work of art, law, event, product, ordinal, percent, time, quantity, money, language 
Text: {0} 
Answer:
 None