I'm going to respond to this in two parts:
AlephNumbers said:
So this is a very interesting article; both the facts and the social commentary/opinion injected into it. While I would tend to agree with V50 that most mobility discussions focus on only half of the mobility, using a measure of relative mobility, this study measures both absolute and relative mobility, which is surprising/great.
Absolute mobility gives the simplest/clearest picture: the vast majority of people do better than their parents. And, in fact, the poor are
more likely to exceed the success of their parents than the rich. That shouldn't be surprising, since the lower you are, the more room there is for growth. To me, these are very positive outcomes. Doing better than your parents is my understanding of what "the American Dream" means to most people, and the vast majority of people -- and virtually all of the poor do.
Relative mobility is where it becomes murky and the wording of the analysis is telling about the social commentary motivating it (nevertheless, the facts are what they are):
Amercans' relative mobility outcomes by family income show a glass half empty.
Pessimistic outlook on a by-definition neutral situation (half is half).
Only 4 percent of adults raised in the bottom half make it all the way to the top, showing the "rags-to-riches"story is more often found in Hollywood than in reality.
Of course: that's what Hollywood is for. Also note, the word "only". It's a very long way from the bottom to the top.
At the other end of the ladder, 40 percent of those raised in the top stay there as adults...
Wait, that's not the mirror-image stat: the mirror would be the fraction that fall all the way to the bottom. And if we follow a single person in isolation, if that person rises from the bottom to the top, that means everyone else drops a spot in the overall distribution, or 1 person drops one level from each quintile. It's an exact balance.
This lack of relative mobility is called "stickiness at the ends" because those at the ends of the income distribution tend to be stuck there over a generation...
Well, getting stuck at the bottom is a bad thing while getting stuck at the top is a good thing, right? If one person rising 4 levels causes 4 people to fall 1 level, is that a net positive or negative? (Trick question: it is exactly neutral)
...across the distribution, 20 percent of Americans are "falling despite the rising tide"" - they make more money than their parents did, but thave actually fallen to a lower rung of the income ladder...
So...wait, is that good or bad? As V50 said and I expanded above, by definition, the relative distribution is static: it can't change at all, much less change for the better or worse. If some people move up the ladder, an equal number must drop, by an equal amount (net). This is the flaw in trying to assess mobility in relative terms, to show economic progress/development. If you have fallen down a rung, but are still better off than your parents, that's still an improvement in standard of living. Indeed, the use of the cliche' "falling despite the rising tide" is a wrong twisting of the actual cliche' "a rising tide lifts all ships". The data shows that a rising tide
does lift at least the vast majority of ships. A tide is a measure of height against a fixed baseline, so applied here, what matters to the analogy is the absolute, not the relative. It should say something like "rising despite dropping back a rung". That's the negative social commentary spin on the data, but in this case you really can't say the glass is "half-empty" because the statistics say it is
more than half full.
Indeed, the other article uses the exact same analogy, but uses it correctly.
Then the next header:
Most Americans Experience Absolute Upward Mobility but Few experience Relative Upward Mobility
If you look at the chart, they list "falling despite the rising tide" as higher income but dropping a quintile in the distribution. As I said before, that's wrong. But what the chart does tell is is that only 16% of all families and only 7% of the bottom quintile experience downward absolute mobility. The vast majority (as said before) experience upwards absolute mobility. And again:
the average relative upward mobility must exactly equal zero.
All-in-all, I don't see a lot of problems here. The absolute mobility is positive (is it positive enough?). The highlighting and spin try to play-up negatives in data that is essentially in mandatory equilibrium by mis-matching statistics on opposite ends of the spectrum. All you need to come away with a positive outlook is to see through that: to recognize that
by definition the quintiles are static (there is a net of zero change in their size), and the only data showing actual change for positive or negative* is the absolute picture.
Then, the conclusion:
While a majority of Americans exceed their parents' family income and wealth, the extent of their absolute mobility gains are not always enough to move them to a different rung of the econonmic ladder.
Duh. By definition/design there is never any change in the net relative distribution and the absolute change is not in any way related. On average, there can't ever be "enough to move them to a different rung" because the rungs move at exactly the same rate as the average income gain!
To me, the most important and problematic piece of information in this report is the
wealth mobility statistics. Half of Americans exceed their parents' wealth, which means half do worse. Given that both incomes are higher and pensions are going away and 401k's rising, you'd expect that to naturally be better. The fact that it is flat despite increases in the related inputs is a net negative. And with Social Security in jeapordy, it points to a growing problem with people not having enough saved for retirement.
There is a confusing set of stats though. In one graphic, it shows the average is 50% exceeded their parents' wealth, with more on the bottom - 72% - exceeding their parents' wealth. But then later, it says the median wealth in the bottom quintile has dropped to only a third of what it was a generation ago. These two facts seem to contradict each other. Can anyone explain that to me?
*I originally wrote that as "better or worse" instead of "positive or negative". One is a statement of mathematical fact, the other a value judgement. That is exactly what the issue of this thread is: mistaking one for the other and/or drawing a false conclusion about one based on an opinion about the other. To whit: if inequality in and of itself is "bad", then a narrowing distribution is "better" or "good", regardless of whether it results in an increase or decrease in absolute income/wealth. Most people's expectation is that rising inequality results in lower incomes at the bottom end ("the rich get richer while the poor get poorer"), but that isn't true, which is why this subject is such a problem. And the study illustrates that: the vast majority are going up in absolute terms. So if we want to be able to say things are "bad", we'll need to find another way to define "bad" and "good" that isn't tied to the math of "positive/negative" or "rising/falling". Something like "not rising fast enough is bad" or "someone rising faster than someone else is bad". Inequality is good for that because it is a derived statistic that can vary up or down. (RelativE) Mobility is not good for that because mathematically it has to be zero-sum: while the number of people going up or down can change, the sum of the up and down is always zero.