What is the best ESTIMATE of the distance Marco Polo traveled between Tabriz and Sumatra?

The graph shows the price of a good compared to the quantity demanded and the quantity supplied. on this graph, the bottom horizontal line represents an ineffective price floor set above equilibrium. an effective price floor set below equilibrium. an ineffective price ceiling set above equilibrium. an effective price ceiling set below equilibrium.

What period of history refers to the time when people did not have written records

Segregation or discriminatory practices that occur even when there is no explicit legal enforcement