Answer :
During Santiago's stay in Tangier, the crystal dealer plays a crucial role as a friend and cautionary example of someone who has become complacent and given up on the pursuit of his Personal Legend.
What is Crystal merchant?
He runs a crystal shop in Tangier on top of a hill, and up until the city's decline as a port, he was rather prosperous.
Although he is a kind man, deeply religious, and generous enough to take in Santiago, he worries following his goal to undertake a pilgrimage to Mecca because he believes that after achieving his dream, he will have nothing else to live for.
The Alchemist's most completely developed irredeemable character is the crystal dealer. (The baker and Santiago's father are also despicable people, though we don't encounter either of them as much as the crystal vendor.)
Therefore, During Santiago's stay in Tangier, the crystal dealer plays a crucial role as a friend and cautionary example of someone who has become complacent and given up on the pursuit of his Personal Legend.
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