During santiago's stay in tangiers, what does santiago teach the crystal merchant, and what does the crystal merchant teach santiago

After working at the crystal shop for a month, Santiago suggests that the shop owner build a display case for the crystal to attract new customers. The owner seems resistant to change, as if he is afraid of success. The owner then tells Santiago that, although he has always dreamed of making the pilgrimage to Mecca, he knows he will never do it. He tells Santiago that he is afraid that, once he achieves his dream, he will have no need to go on living. Santiago ends up convincing him on certain issues, and within the year Santiago spends working at the shop, the owner makes several changes that improve business. At the end of the year Santiago resolves to take the money he has saved, buy a flock of sheep and return to Spain. As he takes his leave, he asks the shopkeeper for his blessing; the shopkeeper gives it, but tells Santiago that he knows he will not return to Spain. The shopkeeper reiterates that he himself will likewise never go to Mecca. He claims that this is maktub - or written by God. Santiago realizes that while he is far from home, he is actually closer than ever to the Pyramids and the treasure. He resolves to take a chance and join a caravan across the desert in search of his treasure.

By working at the crystal shop, Santiago learns many lessons. One of the most important is that it does not take an exterior force to prevent one from realizing one's dreams. The shopkeeper is actively trying to avoid achieving his dream, because he believes that if he achieves it he will have nothing to aspire to. It is with this in mind that Santiago decides to continue on his own quest.