Maybe not for smalltalk but for python there is a number of surveys that prove that by replacing java with python you can scale down developing time by 2-3x times. By "prove" I mean projects that have actually done that.  Not quite a 10x but I think its impressive non the less and I think the numbers wont be very dissimilar for smalltalk

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From: Michael Haupt <mhaupt@gmail.com>
To: "Pharo-project@lists.gforge.inria.fr" <Pharo-project@lists.gforge.inria.fr>
Sent: Saturday, 28 January 2012, 23:29
Subject: Re: [Pharo-project] Smalltalk for small projects only?

Janko,

Am 28.01.2012 um 21:08 schrieb Janko Miv��ek <janko.mivsek@eranova.si>:
>> I think this is a post that clearly illustrates the big problem with
>> smalltalk. The very fact that is compared with Java and Java survives.
>
> Yes, that 4-5 peole can do what 50 Java people are needed is both a
> blessing and a curse :)

I wanted to ask this earlier: is there actual evidence for this, or is it just boasting?

> Blessing because of productivity, curse because
> we are not able to scale beyond one highly connected development group.
> We don't have project management practices and tools, while Java guys
> have because they need them from the start.

I'm not so sure the people at those Smalltalk firms building software for banks et al. have no project management. Boasting? ;-)

Best,

Michael