Magellan's discoveries affected the market demand curve for spices by shifting it to the right which meant demand increased.
A change in the market curve for cinnamon would be due to an increase in demand.
Thanks to Magellan, Europeans were able to get more spices from India and SE Asia without having to go through Arabic lands.
This increase the supply of spices which led to the prices of spices falling. As prices fell, demand then rose to benefit from the lower prices.
This increase in supply was why the market demand curve for cinnamon changed.
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