50 ! +
how is a family group or clan making the decision that the settlement will grow barley and other grains an example of the advancement of that civilization?

it shows that a central group is organized and making decisions as a government which is a sign of civilization.
it shows that the civilization has capable leaders who know that barley and other grains will grow well in the region.
it shows that no one else is experienced enough in agriculture to make decisions that will affect the strength of the civilization's economy.
it shows that a central group is hopeful that other nearby civilizations will want to buy barley and other grains in exchange for other crops.