### Question
How does Differential Subsidy Program define base period costs?


### Answer
Under *APPENDIX U.S.C. § 1173*, **base period costs** is defined as:

> 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 24A-MERCHANT MARINE ACT, 1928 > SUBCHAPTER VI-VESSEL OPERATING ASSISTANCE PROGRAMS > Part A-Operating-Differential Subsidy Program**

