Your individual responses are not vehement; however, last time I looked you had > half the responses in this thread (needless to say all taking the same "side"), which suggests that for whatever reason this is an issue you have strong feelings about. I was curious as to why.

In practical terms I think you (and Locklin) are committing a basic error of comparing unlike quantities, perhaps unintentionally.

Take cars, again; I think I have you checked-and-mated. Here goes:

(i) you seem to believe that with respect to personal transportation 1909-1959 saw a "significant" change because cars went from novelty to primary means of conveyance

(ii) you point out that cars haven't changed radically in 1959-2009; they are neither radically "better" (according to a metric like fuel efficiency) nor is the experience of driving 2009 cars radically different than 1959 cars

(iii) you now want to assert that the change in "everyday transportation" is greater from 1909-1959 than from 1959-2009

The structure of this argument is:

- the change you care about in (i) is SOCIAL CHANGE (in terms of lifestyles, activity pattern, etc.)

- the change you care about in (ii) is TECHNOLOGICAL CHANGE (for which Locklin used the proxy metric FUEL EFFICIENCY)

- in (iii) you want to conclude that "amount of SOCIAL CHANGE" is declining

- but (ii) is pretty much the definition of a "red herring": FUEL EFFICIENCY and SOCIAL CHANGE don't have all that much to do with each other other than being measurable quantities (loosely speaking)

It's a nice cognitive trick:

- "progress" is a fuzzy word with lots of meanings in lots of places

- you want to make people accept a statement about "progress" in a particular context (overall technological progress)

- you accomplish this by inserting a factual-but-unrelated statement evidencing a lack of "progress" (in this case: in fuel efficiency)

- this "primes" the brain to accept a semantically-similar conclusion without adequate supporting argumentation

...and using FUEL EFFICIENCY as your metric is silly, especially from a physicist: given that it can't be much better than it is given the constraints at hand its lack of progress is a given, and it's only really useful in the argument for its semantic priming effect.

A less kind summary of the proposition at hand is:

- When cars became widely adopted they caused radical social change.

- Incremental changes to cars have (obviously, lol) not caused similarly radical social change (unsurprisingly)

- Ergo the rate of technological progress is slowing down, as evidenced by the lack of radical changes in cars (wut?)

This ought to be seen as a category error, full stop...but it's good enough to pass muster as a rah-rah for the self-styled iconoclast brigade; that's some mighty-fine reasoning-work there, Lou.

But, hey, let's keep running with it.

Even if you're completely right -- car-induced changes in everyday transportation are insignificant in the 1959-2009 era -- you're looking at stuff in a silly way.

I'm going to make the case for air transport being a comparable shift: air transportation did not become easily affordable for consumers until the 70s or 80s or 90s (depending on who you ask and which country you were in).

Before it became affordable it was a luxury item (hence the term "jetset" for the leisure class who could afford to travel around like that), and if people traveled long-range they did so by boat, train, or automobile.

In the modern era air travel is often unbelievably inexpensive -- in some parts of the world international tickets are on par with an expensive restaurant -- to the point that long-distance travel by anything other than plane is rare-to-nonexistent (depending on where you live and how you define long-distance).

Is this a "significant" shift? I LOL at you, b/c:

- if you say "no", you undercut what you claim in (i): that a change in affordability (leading to wider adoption and also to use for a wider variety of things than when it was expensive) counts as "progress"

- if you say "yes" you save (i) so I assume you're going to say (i)

So within the category of "personal transportation" (a mild generalization from "everyday transportation") we have had a significant technological change in the 1959-2009 era.

You can argue it's less significant than the automobile-induced changes; I've got stuff to do so won't participate but at least we're now comparing like kinds (SOCIAL CHANGE and SOCIAL CHANGE instead of SOCIAL CHANGE and FUEL EFFICIENCY).

But social change is a wiggly thing (and the perception of it is often colored by value-judgments; witness Locklin talking about most technology just enabling bad behavior); the appeal of the invalid argumentation strategy is that by throwing in hard facts you make your opinions on relative magnitudes of social change look more objective (and this will work up to the point at which you get called out on the apples-to-oranges).