American grievances against taxation by the british parliament we they legitimate?

Yes, they were legitimate because there should be no taxation without representation. Many of the things they were being taxed on were used heavily succh as paper and tea.

During the Townshend Acts, which placed a tax on certain goods that the colonies received from Britain, the colonists protested by boycotting British goods. During the Tea Act, the colonists protested by the Boston Tea Party, where 50 men dressed as Mohawk Indians threw all the tea into the sea.:)

Explanation:

Ain the free market economic system the government is hands off from all supply and demand rates