class PriceIndexObservation implements IndexObservation, ImmutableBean, Serializable {

  public static PriceIndexObservation of(PriceIndex index, YearMonth fixingMonth) {
    return new PriceIndexObservation(index, fixingMonth);
  }

  private  PriceIndexObservation(
      PriceIndex index,
      YearMonth fixingMonth);

}