Depends who’s buying. I’ve written before about the side effects of the Spanish electoral system for some of the smaller parties, but the results of this year’s election leave things very clear. I came across the diagrams below from El País via a post on El Siglo de las Luces. The first one shows how many parliamentary seats each party would have if the assignation of seats was done on a national scale rather than by province. The number of seats they should have got is the first figure, the second is the number actually obtained. CiU's figure is already out of date, they lost a seat to the PP yesterday because of the overseas vote.
So under a more proportional system both the PSOE and the PP would lose several seats, the Basque nationalists of the PNV would also lose a couple and Nafarroa Bai would disappear from the parliament. On the other hand, Izquierda Unida would have 14 representatives instead of just 2, and the new party UPD would go up from 1 to 4. Conclusion, the principal beneficiaries of the system are the big national parties, and the main losers are the smaller national parties. This dispels the myth that parties like IU are underrepresented because the regional nationalist parties do well out of the electoral system. The second diagram shows how many votes were needed per seat won for each party:

So at the moment Izquierda Unida needs almost half a million votes to get a single representative in the Spanish parliament, whilst at the other end of the scale the PNV needs just 50,000. In this election, the PSOE needed slightly fewer votes than the PP for each seat gained, but once you allow for the extra seat the PP got yesterday then the difference is very small.
So under a more proportional system both the PSOE and the PP would lose several seats, the Basque nationalists of the PNV would also lose a couple and Nafarroa Bai would disappear from the parliament. On the other hand, Izquierda Unida would have 14 representatives instead of just 2, and the new party UPD would go up from 1 to 4. Conclusion, the principal beneficiaries of the system are the big national parties, and the main losers are the smaller national parties. This dispels the myth that parties like IU are underrepresented because the regional nationalist parties do well out of the electoral system. The second diagram shows how many votes were needed per seat won for each party:
So at the moment Izquierda Unida needs almost half a million votes to get a single representative in the Spanish parliament, whilst at the other end of the scale the PNV needs just 50,000. In this election, the PSOE needed slightly fewer votes than the PP for each seat gained, but once you allow for the extra seat the PP got yesterday then the difference is very small.
























