For consumers and producers actively involved in buying and selling mangos, how would the original demand/supply curve of the mango market change in the following situations? Please draw the original and new curves and explain how they shift and why.
(1) If the price of pineapple, a substitute, decreases.
(2) If the price of mangos decreases.
(3) If the price of a complement decreases.
(4) If the demand and supply of mangos increase. How will the new intersection price and quantity change?