What is an example of islands of economic development?

In “the first seven years” by bernard malamud, how does sobel’s love of reading contrast with feld’s feelings about education?

Firms use marginal analysis to determine prices by a) changing prices in accordance with information from retailers. b) using comparisons with strong competitors to position prices accordingly. c) examining the effect on revenue of small changes to the price of one item. d) trying to minimize production costs by using better and more efficient methods.

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