Explain one affect that the plague had on Feudalism (you can talk about the classes, the manors or Feudalism in general).

When the Black Death swept over Europe and wiped out a third of its population, it also destroyed Feudalism. Peasants were free to leave the lands of the lords to try to find higher wages because of the huge labour shortages. The land that had usually been the primary source of wealth was now worthless.

Explanation:Because When the black death killed a third of the population the peasants were free because they did not have to work as pesants anymore. Your welcome

no , per capita income is not a true measure of the development because: -it only tells us about average income not how income is distributed among the people.it only give us an idea of the economic aspect.it is only at the qualitative basis.moreover, income is not only the way of development other factors are also as much as important as income.