Why are truffles so expensive?

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auction-trufflesTruffles are valuable because they are very rare and hard to find. It is estimated that the demand is 10 times greater than the supply. World production of truffles is insufficient to meet the needs of the market. Wild truffles yields decreased with each passing year, and cultivated truffles are unable to reduce prices because of low yields. White truffles (Tuber magnatum), which only grow wild, reaching $ 3,000 one kilograms in the U.S., black winter truffles (Tuber melanosporum), exceeds $ 1,000, and black summer truffles (Tuber aestivum) currently sells between 700 and 900 $