When the land differs in quality , the limited amount of certain quality is the source of so-called differentiated rent . Ricardo thought that Europe of that time had quite substantial amount of land , which didn 't give rent . However , from the perspective of his theory , nothing could have changed , if this had been true . Rent wouldn 't be simply differentiated , but would have remained the rent of ``rareness . The important input of Ricardo 's theory is the fact that he proved...











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