You didn't list any factors, but there were many.
For instance, the USA entered World War I because Germany had sunk a ship with US passengers, the Lusitania, after an agreement that neither would attack in the sea warzone.
Another factor that caused the USA to enter World War I was the Zimmerman Telegram, Germany sent a coded telegram to Mexico in hopes of getting Mexico to ally with them and turn against the USA.
Hope this helps!
The answer is:
In this case, Cecilia only decides to buy the necklace, knowing that the cost of diamonds depends only on the demand.
She will find a good price, because she knows the product availibility exceeds the demands, making the prices go low! when people start looking for this kind of diamond, the reverse will happen. The demands will exceed availability and prices will rise. Cecilia takes advantage of the fact that demand is low.
