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With zero, we can easily convert fractions to decimal form (like 1/2 to 0.5), which obsoletes the need for complicated conversions when dealing with fractions. This is the “unit of account” function of zero. Prices expressed in money are just exchange ratios converted into a money-denominated price decimal: instead of saying “this house costs eleven cars” we say, “this house costs $440,000,” which is equal to the price of eleven $40,000 cars.