What's the Name of That Book??? discussion

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Life on Paradise Island
SOLVED: Children's/YA
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SOLVED. Children's/Educational Picture book. Rice is currency on an island - economic system develops. [s]
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Can you describe the illustrations - e.g., simple or detailed, realistic or cartoon-like, painted watercolors or bold graphics, bright or dark colors? Do they remind you of a similar illustrator or picture book author?
Story about a group of people living on an island who develop an economic system - eventually begin using rice as currency. Then pests/other issues destroy the crops, causing the economy to evolve beyond rice.