A exchange is one in which both parties participate in a transaction through which each expects to gain.

The social system of India that assigns certain tasks to specific social groups is known as the system.

are groupings of people engaged in the same kind of occupation.

A major factor in the change in attitude toward time and work was the religious movement known as .

The was one of the first places in Europe of the middle ages that required precise division of time.

The institution of discouraged technological innovation and fostered a negative attitude toward work.

agriculture can support the largest population, but requires the most work.

Slash and burn agriculture could leave the land for up to twenty years.