As a delegate to the World Trade Organization, Kate stated during negotiations that the same rules and regulations that applied to another country's domestic firms must also be applied to her country's firms operating in that country. Kate was invoking the (T2)

Principle of National Treatment

Explanation:

The World Trade Organization (WTO) established the principle of national treatment in order for the member states to treat foreign products equally to domestic products. This means that any legally imported good should receive the same legal treatment as domestically produced goods, e.g. they have to be taxed the same way.

answer: marginal utility of the fourth brownie is 0.

explanation: marginal utility is the addtional utility gained from the consumption of one more unit of a good. it is given by,

so, marginal utility at the 4th unit will be given by

since, the values are not given here, you can simply find marginal utility at fourth unit by subtracting total utility at 3rd unit from total utility at 4th unit.