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The mother country has full advantage over the colony in the fact that it has full advantage of taxation rights.
Also, take a look at the "boston tea party" as well as "the war of independence". These events are the product of over taxation from the mother country.
Mercantilism for the mother country was good because it helped the mother country to profit from the goods it sold. Coloneis were at a disadvantage because they were taxed by the British to pay for French and Indian War debts.