Who is the greediest character in The Pearl?

In The Pearl, John Steinbeck deploys a powerful central symbol to support his critique of materialism. Greed motivates desire for wealth and prosperity, which many of the characters display. Possession of the valuable peral changes Kino; even though he wants to use it to save his son, the object and the possibilities it represents take on a life of their own. For the first time, he can contemplate a life of comfort. Yet in his innermost self, Kino retains a kind of purity. He wants what is best for his son and his wife, and he hopes for dignity and respect. Although Kino displays greed, he is not completely transformed.
Among all the individuals who attach themselves to Kino, the doctor seems the most affected by greed. At the outset, he refuses as a rule to treat patients who cannot pay upfront. Once he realizes that Kino has such a valuable item, however, he goes one step further. He prolongs the boy’s suffering just so he can benefit financially. This unethical behavior is motivated only by his desire for wealth.