#price_index__priceindex__price_level__pricelevel  an index that traces the relative changes in the price of an individual good (or a market basket of goods) over time
  supertype:  index_number__indexnumber__index__indicant__indicator  a number or ratio (a value on a scale of measurement) derived from a series of observed facts; can reveal relative changes as a function of time
  subtype:  retail_price_index  an index of changes in retail prices
  subtype:  producer_price_index__wholesale_price_index__wholesalepriceindex  an index of changes in wholesale prices
  subtype:  consumer_price_index__CPI__cost-of-living_index  an index of the cost of all goods and services to a typical consumer

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