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"Shut up," said Ralph absently. He lifted the conch. "Seems to me we ought to have a chief to decide things."
"A chief! A chief!"
"I ought to be chief," said Jack with simple arrogance, "because I'm chapter chorister and head boy. I can sing C sharp." (1.229-231)
Sure, bet that C sharp really comes in handy when you're trying to keep a group in order. Jack thinks he should have the power because he's always had it. There's nothing special about him; he doesn't have any particular talent for leading. He's just arrogant. And sometimes that's enough.
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).