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The suffusion drained away from Jack's face. Ralph waved again for silence.
"Jack's in charge of the choir. They can be—what do you want them be?"
Jack and Ralph smiled at each other with shy liking. The rest began to talk eagerly. (1.254-257)
Check out how Ralph gets Jack on his side by sharing power. He's set up to be a good leader, taking into account the needs and desires of his group. Too bad it's not going to last.
“You're no good on a job like this.”
“All the same –”
“We don’t want you,” said Jack, flatly. “Three’s enough.” (1.274-276)
While Ralph and Jack both assert authority over Piggy, Ralph at least tries to explain his reasoning (the mark of a good leader), whereas Jack brings personal insult to the matter (the mark of a bad leader).
"I don't care what they call me," he said confidentially, "so long as they don't call me what they used to call me in school."
Ralph was faintly interested.
"What was that?"
The fat boy glanced over his shoulder, then leaned toward Ralph.
"They used to call me Piggy!" (1.65-70)
Before the boys reveal their names, they are identified by their appearances. Ralph is "the fair boy" and Piggy the "fat" one. But Piggy's name itself refers to his weight, which means even back in the civilized world appearance determined identity. We might feel better knowing everyone's real name, but is there really a difference between being called "the fat boy" and "Piggy"? Aren't they really the same thing?