We are having a graded discussion and I'm looking for some ideas. I have some of my own, but I could use some more.

The first question is: Which is more likely to cause change, the movement of poeple through migration/nomadism, or the development of cities? Do different types of change come about as a result of each?
The second question is: Compare the economic changes that occured during the European Renaissance with the economic changes that occurred in China during the Tang and Song Dynasties.

Any input is greatly appreciated! Thanks.