Typically its effect is kinder to larger parties than using the Droop quota or Hare quota. It produces smaller numerical quotas, which creates a risk that more candidates will be elected with full quotas than there are seats. Indeed, in a two list election, or in an STV election where all votes transfer, it is inevitable that the wrong number of candidates will be elected, requiring some further adjustment. This flaw means that it is rarely used.
The Droop quota was devised in 1868 by the English lawyer and mathematician Henry Richmond Droop (1831-1884) as a replacement for the earlier Hare quota.
This gives the Droop quota the special property that it is the smallest integral quota which guarantees that the number of candidates able to reach this quota cannot exceed the number of seats.
The Droop quota is generally considered superior to the Hare quota because under the Hare quota it is sometimes possible for a group of candidates supported by a majority of voters to receive only a minority of seats, and this result is considered undemocratic.
The Imperialiquota is a formula used to calculate the minimum number, or quota, of votes required to capture a seat in some forms of single transferable vote or largest remainder method party-list proportional representation voting systems.
Typically its effect is kinder to larger parties than using the Droop quota or Hare quota.
It produces smaller numerical quotas, which creates a risk that more candidates will be elected with full quotas than there are seats.