How did the kings of ghana use the law of supply and demand to their advantage?

The kings of Ghana used the law of supply and demand to their advantage by limiting the amount of gold available for trade, increasing its value.

Explanation:

According to the law of supply and demand, when there is a high demand of a product but the amount of the good available for trade is scarce - either naturally or forced - the price of the goods will increase. This is what the kings of Ghana did, becoming a strong force in trans-Saharan trade.

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i think a judge or jury, as they preside over the court and is the central figure in a trial.

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the perimeter of a triangle is 69 cm. side a is 5 cm shorter than side b. side c is twice as long as side a. find the length of each side. i need to know how to do it in 2 equations.  

equations:

a = b-5

c = 2a

a + b + c = 69