Compare and contrast the technologies used in Image A and Image B. What generalizations can you make about these technologies? Which technology do you think would be a more effective printing process? Why?

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