From 1235 to 1645, the mali empire ruled the medieval islamic west african state of mandinka. during this time, the mali empire became famous for the wealth of its rulers such as mansa musa i. the mali empire influenced west africa's culture as it spread its language, laws, and customs to areas along the niger river.
the mali empire succeeded because of its trade. the empire's main goods were salt, copper, and gold. each ounce of gold or salt that entered the empire's borders was taxed. almost half of the old world's gold came from mali by the 14th century.
as its subject states began to break off and declare independence, the mali empire began to decline. the songhai gathered strength and soon rose to form an empire of its own.

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productive most commonly means: achieving or producing a significant amount or result.

explanation:

productive can also mean:

these depend on how the word productive is used. most likely productive will mean   achieving or producing a significant amount or result.

changes in factors like average income and preferences can cause an entire demand curve to shift right or left. this causes a higher or lower quantity to be demanded at a given price. demand curves relate the prices and quantities demanded assuming no other factors change. it is important for consumers to know this information, because it is crucial for them to know what they can afford and can't afford. i hope this .

semi-desert lowlands, hope this !