complete the chart to identify the kinds of information and benefits provided by each type of primary source historical evidence for each resource type listen example and how this particular type of resource can help support an argument

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