Pigovian Tax on Carelessness
Kevin Drum links to a NY Times article that, mainly through annecdote, seems to be trying to fabricate the "next" consumer crisis, over debit card overdraft fees. The key chart, containing about all the real non-annecdotal data in the article is below:
I wrote in the comments:
Wow, the NY Times almost fooled me with this chart. Yet again they play games with scale and timeframes to make a point that is not correct. For example, it looks like overdraft fees may have risen faster than transactions, but that is because the overdraft fee revenue chart goes back to 1992 and the transaction chart only goes back to 2000.
If we look at both from 2000, we see overdraft fees on debit cards have gone from $20 billion to $38 billion today, or about a 90% increase. At the same time, dollar amount of purchases on debit cards went from $0.3 trillion to $1.3 trillion (as well as I can read the graph) or an increase of 333%. I understand that there may be a mix shift I am missing - the overdraft numbers include charges for checks as well as NSF fees, but the article does not have the changing mix. This is another topic, but why can't reporters even at the Times include all the numbers you really need to analyze this stuff - don't they try to do these calculations? They have graphs side by side, implying one should compare trends, but they have apples (debit card transaction volume) next to oranges (all overdraft charges, including debit cards but other stuff too) on completely different time scales.
Anyway, by the article's own numbers, the overdraft fee volume has grown 3.5 times slower than transactions, meaning that overdraft fees have dropped from 6.7% to 2.9% of debit card transactions. This shift may be less dramatic if there are mix changes in the fees, but never-the-less, why isn't this good news? The world is never going to make the price of carelessness=0, if for no other reason that the moral hazard would be so large. But the high price on carelessness in this case seems to be reducing the frequency of people being careless (if the price of an overdraft has really gone up as implied anecdotally in the story, then the frequency must be way down -- sure missed that data in the article). We want to raise the price of Co2 to produce less of it - why don't we applaud when we raise the price of carelessness and we get less of it?









