Droop proportionality means that a majority-size solid coalition will always be able to elect at least half of the seats. This is because a majority is always over n/2 voters, and that will contain half of the Hagenbach-Bischoff quotas (There are (k+1) Hagenbach-Bischoff quotas in an election, since (n/(k+1)) * (k+1) = n, so (k+1)/2, which is half of the quotas * n/(k+1), which is the quota, = n/2).