Expressing that if one thing increases, the other also increases; 'the more, the more'.
Long explanation:
The ~も~ば~も~ grammar point is used to express a relationship between two things where if one thing increases, the other also increases. It can often be translated as 'the more, the more' in English. The first part (the increasing variable) is paired with も, and the second part (the resulting effect) is paired with ば.