WHY DID THE MING REFRAIN FROM EXPEDITIONS?

Which of the following is a claim about ancient rome that a historian could build san argument around

One drawback of voluntary trade is that it a.requires two groups to use a common language b.can make one group dependent upon another for necessary goods c.doesn't occur unless there is a shortage of goods for at least one group d.forces groups to rely on themselves to produce all the goods they need

The supreme court case mcculloch versus maryland endured that