The Relationship between Spending and Performance – Correlation and Causality
The rhetoric from UEFA regarding Financial Fair Play seems
to be that it is essential for the long-term health and sustainability of the
game that clubs are encouraged to be responsible and ‘live within their own
means’. A joint statement released last year from the European Commission and
UEFA outlines that the aims of FFP are to:
●
Improve the economic and financial capability of clubs;
●
Increase transparency and credibility;
●
Improve governance standards in football;
●
Encourage clubs to operate on the basis of their own revenues;
●
Introduce more discipline and rationality in club finances;
●
Protect the integrity and smooth running of UEFA club
competitions;
●
Encourage responsible spending for the long-term
benefit of football;
●
Protect the long-term viability and sustainability of
European club football.
Furthermore it is claimed that “These are objectives which
UEFA, as governing body for football in Europe, will promote in a balanced and
proportionate way, acting in accordance with all applicable legal rules and, in
particular, within the framework of EU law” http://ec.europa.eu/competition/sectors/sports/joint_statement_en.pdf.
We have seen in the past that football is not immune to
general European legislation, in particular we can look at the Bosman Ruling of
1995 as an indication that any infringement on general European Union Law, such
as the free movement of workers, is likely to end up in the ECJ. European Union
Competition Law is intended to prevent companies abusing their market power,
indeed with regards to sport the European Commission states:
“Most sport cases have been handled under EU antitrust rules,
which prohibit anti-competitive agreements and practices as well as abuse of
a dominant position. These cases concerned revenue-generating activities
connected with sport, such as media rights and ticket sales and regulatory/organisational
aspects of sport” http://ec.europa.eu/competition/sectors/sports/overview_en.html.
It is therefore perplexing that the EC appear to be fully
supportive of FFP when there is strong evidence that clubs in dominant
financial positions are going to benefit the most from the new regulations.
Recently, Arsenal, Liverpool, Manchester United and Tottenham submitted a
statement to the FA requesting tighter financial control for the Premier League
in line with UEFA’s FFP regulations. It is no coincidence that these are
traditionally wealthy clubs with high revenues, seeking to limit spending to a
club’s self-made resources. Additional measures for the Premier League have now
been passed by the narrowest of majorities meaning FFP is not just something
that clubs wanting to compete in Europe should be concerned with. I among
others have argued that these regulations are anything but supportive of a
sustainable sporting environment as UEFA claim, primarily because they limit
competition, which in the long run will be detrimental to the health of the
game.
Data
The data (kindly supplied by Stefan Szymanski) comes from
all four professional English leagues over a ten-year period from 2000/01 to
2009/10. The data is not complete with figures missing from a number of clubs,
particularly from lower divisions, however the volume is sufficient for this
analysis. The data covers Final League Positions, Revenue, Wages, Profit/Loss
and I have added the additional variable Spending. I have calculated spending
as a team’s revenue minus or plus their profit or loss respectively, i.e. a
team with a revenue of £100 million and a profit of £10 million has only spent
£90 million, whereas a team with the same revenue and a loss of £10 million has
spend £110 million.
Assumptions
It is commonly thought that football clubs that spend
more are likely to perform better in the long run. This is because of the
logical assumption that performance is based on talent i.e. a team with more
talented individuals is more likely to succeed in the long run than a team with
less talented players, as well as the equally logical assumption that more
talented players will cost more money to obtain (transfer fees), and maintain
(wages). This is an important assumption for analysing the relationship between
performance and spending.
Part 1 – Correlation
Correlation analysis is a
statistical measure of how two variables relate to each other. I am interested
in how performance compares to spending and will examine the data holistically,
annually and annually by division.
Overall Relationship
The first thing you will undoubtedly notice is
a sharp rise in spending from around 20th up to 1st demonstrating
the obvious financial clout of the Premier League. For the remaining leagues
there is a gradual slope as the line progresses further down, but the gradient
becomes almost negligible in League 2 (Division 4). There is a clear
difference in variance between Premier League team spending and the remaining
three leagues, which appear much closer. For example, results from the
Championship range between £2.6 million and £72 million, whilst the Premier
League has a range from about £21 million to over £320 million. You can even go
as far as to say that the Premier League has its own split with teams regularly
finishing above 8th exhibiting much larger spending than others. It is also interesting to note that
no team has won the Premier League spending less than £100 million
during this period. I have also calculated the Pearson Correlation for the
entire data set and the value of 0.629 suggests a strong linear relationship
between spending and performance.
To explore the annual relationship I have selected
seasons 2000/01, 2004/05 and 2009/10 to provide a spread across the entire
period. I have not included all years for the sake of
repetition, but rest assured they all look pretty similar to these three. I
have used LOESS regression as this allows us to identify an approximation using
a localised trend, i.e. the calculations give higher weighting to
data closer to the point in question.
Annual Relationship
As you can see the pattern is very similar to
that already established. You will also note that lower league spending has
hardly changed over the ten years whilst Premier League spending has more than
quadrupled from just over £50 million to just under £220 million, using the
LOESS curve. Pearson Correlation gives us 0.736, 0.606 and 0.668 for 2001, 2005
and 2010 respectively, suggesting the linear relationship has remained strong
over the entire period.
Annual Divisional Relationship
Using the same seasons as above I have analysed the data for each division separately. I have left out the fourth tier due to the lack of data.
The Premier League
The graphs indicate that teams in the lower
half of the league tend to be reasonably close in terms of their annual spend,
whilst the top positions tend to go to teams that spend the most. Teams that
appear to over perform in terms of their relative spend do so because of bumper
profits i.e. Arsenal in 2001, Everton in 2005; or turn out to be one season
wonders i.e. Ipswich 2001. It is clear that in the Premier League money is not
sufficient to guarantee success, but it is certainly necessary for sustained
competitiveness at the highest level.
The relationship in the Championship is a lot less clear. The correlation is a lot less defined than in the Premier League, however, the winners of the league in each season tends to be one of the top spenders. In the entire period the winners of the English second tier only spent below £20 million on two occasions, and on only one occasion, West Brom in 2007/08, did any winning team avoid making a loss. This raises the question of whether these successful teams would have achieved this under stricter financial restraints; a question that we are likely to see answered over the next decade of football under such conditions. The average correlation for the period was 0.451. Clearly the relationship is nowhere near that of the Premier League, however, there is still empirical evidence to suggest that money plays a pivotal role in determining success.
League 1
The English third
tier, League 1, is similar to the Championship. The correlation is a lot less
significant than the Premier League, yet the data shows a slight upward
inflection towards the top of the league. Average linear correlation is 0.499,
so again there is a case for the importance of spending for success.
Part 2 – Causality
Correlation
≠ Causation
Correlation and Causation is not the
same thing. If one variable causes another then they are almost certainly
correlated, but just because two variables are correlated does not mean that
one necessarily causes the other.
It is difficult to claim solely from
correlation analysis that spending is the key driver of performance, and unlike
correlation, causality is extremely difficult to establish using statistics.
However, it would take a brave individual to argue that money is not a critical
factor in determining long-term success.
Spending is the most plausible
determinant of performance if we accept the critical
assumption that talent drives performance and that more talent costs more
money. If we accept that there is a link between talent and performance, and
that better players cost more money to buy (transfer fee) and to maintain
(wages), it seems irrefutable that the amount of money a club spends is going
to significantly shape performance.
The outcome is, unsurprisingly,
almost identical to that between Spending and Performance. This is because
wages make up the bulk of every clubs annual outgoings. It is increasingly rare
for a club to spend less than 50% of their revenue on wages. Despite the lack
of robust scientific control studies it seems appropriate to call the
correlation between Spending and Performance a causal relationship.
If it really is the European Commission’s
mandate to prevent the abuse of a dominant position, then to allow, and even
support UEFA’s FFP regulations is nonsensical.
Conclusion
In previous articles I have argued
that competition is critical to the long-term health of the game. This is
fundamentally due to the fact that football, like any other professional sport,
requires fans that spend money on ‘the product’ i.e. watching games (at the
ground, on T.V.) and buying merchandise. In turn, media coverage grows with fan
interest, whilst worldwide interest grows with the increased media attention.
The amount of money television companies are willing to pay for the rights to
show games also increases with a rise in interested spectators e.g. there is a
reason the Premier League has a much higher total T.V. deal than La Liga.
Competition is key!
Under Financial Fair Play spending
is likely to become synonymous with revenue for the vast majority, meaning
performance will be somewhat restrained and predictable. The idea that FFP will
secure a more viable future for the game is delusional. In the short-term the
clubs making losses will inevitably spend less, and their performance is likely
to suffer for it. In the long-term teams in dominant financial positions will
be able to consolidate their sporting positions at the top with an ever-increasing
gap that will be impossible to traverse (see my previous article discussing
Sass http://journaloffootball.blogspot.co.uk/2012/10/normal-0-part3-why-ffp-is-end-of.html).
Predictability will ultimately destroy consumer interest in football; perhaps
not for every supporter, but the global nature of the modern game means that,
financially at least, the majority of clubs will be worse off under FFP.