It is easy to spend money in football. Spending it well is a lot harder.
At the very top, the sport is awash with spendthrift billionaire owners and ever-increasing television revenues leading to eye-watering transfer fees.
To compete, it is imperative that the top clubs have thorough scouting, smart recruitment, intelligent coaching and, above all, a manager who can blend all of this into a successful side.
Over the past two seasons, each of the Premier League's 'big six' - Arsenal, Chelsea, Liverpool, Manchester City, Manchester United and Tottenham - have kept their manager. But which have delivered the best return on their transfer outlay in that time?
Big six managers over past two seasons
Manager Club Net spend Points Cost per point Major trophies
Pep Guardiola Manchester City £360.04m 175 £2.06m 2 (2017-18 Premier League & League Cup)
Jose Mourinho Manchester United £261.67m 147 £1.78m 2 (2016-17 League Cup & Europa League, in 2017-18 FA Cup final)
Arsene Wenger Arsenal £84.01m 135 £622,296 1 (2016-17 FA Cup)
Antonio Conte Chelsea £73.46m 163 £450,674 1 (2016-17 Premier League, in 2017-18 FA Cup final)
Mauricio Pochettino Tottenham £33.06m 160 £206,625 0
Jurgen Klopp Liverpool -£720,000 148 £0 0 (in 2017-18 Champions League final)
John Stones and Kyle Walker
John Stones and Kyle Walker both cost Man City large fees
You don't spend money like Manchester City without attracting criticism. The barbs have been both overt (from rival fans) and veiled (none more so than Manchester United boss Jose Mourinho's January complaint that City "spend striker money on full-backs").
City are, at present, the alpha males of the market, in the Premier League at least. During the two seasons of Pep Guardiola's reign at the club they have spent £476m to bring in 23 players, including an unprecedented Premier League outlay of £284m during the two transfer windows of 2017-18.
But City have not been throwing good money