### Question
What is the definition of base period costs?


### Answer
The definition of **base period costs** is as follows in *APPENDIX U.S.C. § 1173*:

> for the base period beginning July 1, 1970, and ending June 30, 1971, the collective-bargaining costs as of January 1, 1971, less all other items of cost that have been disallowed by the Secretary of Transportation prior to ninety days following October 21, 1970, and not already excluded from collective-bargaining costs under subparagraph (A)(i) or (A)(ii) of this subsection

#### Citation:
  - *APPENDIX U.S.C. § 1173*
  - Heading: **CHAPTER 27-MERCHANT MARINE ACT, 1936 > SUBCHAPTER VI-VESSEL OPERATING ASSISTANCE PROGRAMS > Part A-Operating-Differential Subsidy Program**

