英超、德甲同西甲，邊個「強弱懸殊」更嚴重？

根據專研全球貧富懸殊問題的經濟學家Branko Milanovic的簡單數據統計指出，西甲的「強弱懸殊」問題較嚴重。

Which league is more competitive (equal)? Premiership 2015 Gini: 17 (top/bottom ratio:2.9) La Liga. 2015 Gini: 21 (top/bottom ratio:4.9)

— Branko Milanovic (@BrankoMilan) August 17, 2015

Milanovic用左簡單的Gini系數方式，計算兩個聯賽的球隊的「聯賽得分分佈」，結果當然是年年由皇馬及巴塞領放的西甲的取得較高的Gini系數。以下為兩大足球聯賽的得分分佈圖

Premiership has much more of a “middle class”; La Liga heavily dominated by the top 10% (2 out of 20 clubs) pic.twitter.com/sMkK8K8xKp — Branko Milanovic (@BrankoMilan) August 17, 2015

你會講，這個答案不出奇。好，再問你，德甲還是英超更「強弱懸殊」？

Bundesliga is not fully comparable (18 teams rather than 20), but its Gini is low: 15 vs. 17 for Premiership and 21 for La Liga.

— Branko Milanovic (@BrankoMilan) August 17, 2015

答案是德甲，其Gini系數只有15（當然，德甲只有18隊，英超有20隊，這令可比性減低）

Bundesliga has really a weird distribution of points: lots of lower middle class and totally hollowed-out middle. pic.twitter.com/VXXnocNooW — Branko Milanovic (@BrankoMilan) August 17, 2015

但看過這個分佈圖，你可以見到「最強」（即係拜仁）其實領放不少，Gini低的主因是中低層的太集中吧？

@cloudyip Yes. Gini is the (normalized) sum of pairwise comparisons among all teams (people). If lots of ppl are bunched together…

— Branko Milanovic (@BrankoMilan) August 17, 2015

———– 點解佢會做一個咁「無聊」的統計？ 因為佢尋晚睇左車路士輸俾曼城3-0…….

@fhollenbach No, found it entertaining on the train tonight to think Man City-Chelsea +5 lead is not much in PL, but would be huge in Liga. — Branko Milanovic (@BrankoMilan) August 17, 2015