code: public com.google.api.ads.adwords.axis.v201809.cm.IncomeTier getTier() {
          return tier;
      }
docs: Gets the tier value for this IncomeOperand.
  
  @return tier   * Income tier specifying an income bracket that a household falls
  under. Tier 1 belongs to the
  highest income bracket.
  <span class="constraint Required">This field is
  required and should not be {@code null}.</span>