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In one of the tasks devised by Piaget,a child is shown two identical beakers filled to the same level with liquid.Next,the liquid from one beaker is poured into a third beaker,which is taller and thinner than the first two.Then,the child is asked if the amount of liquid in the tall,thin beaker is equal to that which remains in one of the original beakers.The child's awareness of which of the followings concepts is tested by this task?
Tariffs
Taxes or duties to be paid on a particular class of imports or exports.
Quotas
Limits set on the quantity or value of goods that can be imported or exported over a specified period.
Countertrade
A form of international trade in which goods or services are exchanged for other goods or services, rather than for hard currency.
Exports
Goods, services, or technology sent out of a country to sell in international markets, contributing to a nation's economy.
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