What moral principles are involved in this case?

HAVING SPEARHEADED THE WOMEN’S CAUSE ON behalf of equal pay for jobs of equal value, Phyllis Warren was elated when the board decided to readjust salaries. Its decision meant Phyllis and the other women employed by the manufacturing firm would receive pay equivalent to men doing work of comparable worth. But in a larger sense it constituted an admission of guilt by the board, acknowledgment of a history blemished by implicit sexual discrimination.
In the euphoria that followed the board’s decision, neither Phyllis nor any of the other activists thought much about the implied admission of female exploitation. But some weeks later, Herm Leggett, a sales dispatcher, half-jokingly suggested to Phyllis over lunch that she shouldn’t stop with equal pay now. Phyllis asked Herm what he meant.