How has hundert developed in the palace theif?

As Mr. Hundert steps onto the ladder of the helicopter to leave the island after the contest, Sedgewick Bell remarks that he has not changed. Each of them behaved exactly as they did when Sedgewick was a boy and Hundert a young teacher at St. Benedict's. Hundert reflects on this and, coming to the conclusion that Sedgewick was right, takes it upon himself to attempt one last encounter. When Sedgewick is addressing a meeting of miners and presenting himself as a champion of the working man, Hundert joins the audience, and Sedgewick point him out as his old history teacher from Richmond Central High School. Hundert refuses to take part in this deception and tells everyone that Sedgewick was actually his pupil at St. Benedict's, an elite private preparatory school.  Hundert reflects that his words made no difference at all. However, he has the satisfaction of knowing that he has finally spoken out against Sedgewick and attempted to expose his lies

the answer is industry

a constant variable, normally called a controlled variable, is the term for a variable that remains constant throughout an experiment, though other variables may change. an example is the water pressure for a faucet when measuring the amount of water released when the faucet is opened to various increments.