If I were to give you a brand new Ferrari you’d quite understandably be ecstatic.
If I were to give you another brand new Ferrari you’d be incredibly happy.
If I were to give you yet another brand new Ferrari you’d be grateful.
If I give you one hundred brand new Ferrari’s you’d want to charge me for storage.
Economists call this notion
the law of diminishing marginal utility - the more an individual consumes of a certain good, the less utility or value they derive from it.
People seem to get very excited whenever these kind of macro numbers are posted - as if they've been shown behind the curtain in some way, it always reminds me of a lot of the reverential way endings to video games used to be talked about in school (no bloody save points back then, three lives and that was your lot). Those who share these numbers are thanked for their 'insight' and so it was last year when the now infamous 'chances created' table was posted.
At the outset, let's be clear - there is no evidence this was used by Comolli or anyone at the club, people saw the table and declared that this was why we had signed the players we did, without explaining why were never linked to Chris Brunt or Kevin Davies. However, to understand why at the time I thought 'this is completely worthless' - have a look at the following (from this season) because there's something quite startling about it.
Plurality is paramount - which is why the mancs single player on the chances created table is towards the bottom, Arsenal don't have a single player on there either.
As we've just witnessed, creating boatloads of chances doesn't explicitly seem to result in a concurrent number of goals, I suspect this is down to a loose form of marginal utility - whether a malaise sets in after a certain point meaning players treat chances with less respect when they know another will be along shortly, or there is some sort of psychological reinforcement at play.
The following is the average for the top eight in 09/10 - the x axis is the number of chances, the y axis is the percentage conversion rate.
The trend is apparent, there is an optimal number of chances for a side to create, after that the chances of conversion decline quite dramatically - with a more granular trendline.
For the entire league.
The trend here is less exaggerated than for the top eight, it probably would have been more interesting had I excluded those sides and just used the bottom twelve. Again, with the more granular trendline.
But surely a chance is still a chance, should they be deliberately forgone because one might be worth less than another? Probably not, but buying runs isn't the answer either.
It might be worth finding out how closely the conversion curve of certain players (van Persie, say) track the trend for top sides, but alas, I can't be arsed.