Players values amortised over the seasons they have been at the club:
MANCHESTER UNITED
PLAYER YEAR SIGNED COST PER SEASON De Gea 2011 £6.30m Rafael 2008 £0.42m Phil Jones 2011 £5.67m Ferdinand 2002 £2.50m Evra 2006 £0.69m Fellaini 2013 £27.50m Carrick 2006 £2.33m Cleverley Youth Player £0 Mata 2014 £37.10m Rooney 2004 £2.70m Welbeck Youth Player £0 TOTAL £85.21m AVERAGE £7.75m per player
MANCHESTER CITY
PLAYER YEAR SIGNED COST PER SEASON Hart 2006 £0.19m Zabaleta 2008 £1.08m Kompany 2008 £1.16m Demichelis 2013 £3.50m Clichy 2011 £2.33m Navas 2013 £22.50m Toure 2010 £6.00m Ferdandinho 2013 £30m Nasri 2011 £7.33m Silva 2010 £6.25m Dzeko 2011 £9.00m TOTAL £89.34m AVERAGE £8.12m per player
We'll ignore the fact that whoever created the graphic has been generous on United's transfer fees and conservative on City's!