妇女节- March 8th
劳动节- May 1st
儿童节- June 1st
国庆节- Oct 1st
Only one firm selling all products in the market.
The absence of the substitutes of these suppliers.
The policy of unique product, i.e., absence of substitute the product sold by one firm,
Barriers to the entry and exit to the markets in terms of government, franchise, patents, copyrights, ownership.
Control of complete information e.g. secret formula.
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Meter-Yard Stick- And etc
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