Invisible hand explanation
Encyclopedia
The German linguist Rudi Keller, holds the view that language change and the alteration of language use is caused by an “invisible hand”. The term invisible hand
Invisible hand
In economics, invisible hand or invisible hand of the market is the term economists use to describe the self-regulating nature of the marketplace. This is a metaphor first coined by the economist Adam Smith...

 itself was shaped by Adam Smith
Adam Smith
Adam Smith was a Scottish social philosopher and a pioneer of political economy. One of the key figures of the Scottish Enlightenment, Smith is the author of The Theory of Moral Sentiments and An Inquiry into the Nature and Causes of the Wealth of Nations...

 and is generally known and established in economics
Economics
Economics is the social science that analyzes the production, distribution, and consumption of goods and services. The term economics comes from the Ancient Greek from + , hence "rules of the house"...

.

The phenomenon of the third kind

Typically the world is divided exclusively into two kinds of phenomena: natural and artificial. However, this leads to a misinterpretation of certain processes like for example linguistics
Linguistics
Linguistics is the scientific study of human language. Linguistics can be broadly broken into three categories or subfields of study: language form, language meaning, and language in context....

 and language
Language
Language may refer either to the specifically human capacity for acquiring and using complex systems of communication, or to a specific instance of such a system of complex communication...

. Keller offers a solution to this dilemma by identifying a third phenomenon that contains natural and artificial elements.
Language for example is artificial since it is created by man, but it evolves naturally in a way that cannot be influenced or predicted by individuals. So language change is caused by the multitude of individual actions, as an unintentional and unplanned structure and the effect of the invisible hand. A phenomenon of the third kind is the causal consequence of a multitude of individual and intentional actions, which have at least partially similar intentions. It is a process and a result at the same time. Keller compares this to the moral conception, which is not an ultimate result, but changes and is only an episode in the processes of cultural evolution
Evolution
Evolution is any change across successive generations in the heritable characteristics of biological populations. Evolutionary processes give rise to diversity at every level of biological organisation, including species, individual organisms and molecules such as DNA and proteins.Life on Earth...

, without a nameable beginning or end.

The three main characteristics of the phenomenon of the third kind:

- It is process-related

- It constitutes on a micro- (the multitude of the individual intentional actions) and macro- (the causal consequences) level

- It cannot be identified as exclusively natural or exclusively artificial in origin

This can be illustrated on the basis of an example: a driver on a highway needs to decelerate for irrelevant reasons. The driver behind him, seeing the brakelights, will brake rather a little bit too much then too little, just as the next driver behind them. This will continue until one car far behind them comes to a standstill. None of these drivers intended to cause a traffic jam, still it happenes.

The invisible-hand-theory

The invisible-hand-theory explains the explanandum
Explanandum
An explanandum is a phenomenon that needs to be explained and its explanans is the explanation of that phenomenon. For example, one person may pose an explanandum by asking "Why is there smoke?", and another may provide an explanans by responding "Because there is a fire"...

, a phenomenon of the third kind, as the causal unintentional consequence of individual intentional actions, with at least partially similar intent. The theory can explain and uncover structures and processes which people unintentionally and without recognition perform as if they were guided by an invisible hand.

The three ideal levels of an invisible-hand-theory are:

1. The depiction of the motifs, intentions, aims and convictions which are central to the actions of the individuals who are involved in the creation of the phenomena, including the surrounding conditions of their actions (formulation of the premise; the cause)

2. Depiction of the process; how the structure to be explained is formed by the multitude of the individual actions (the general laws)

3. Depiction of the phenomena/structure originating from these actions

The points one and two are the hypothesis
Hypothesis
A hypothesis is a proposed explanation for a phenomenon. The term derives from the Greek, ὑποτιθέναι – hypotithenai meaning "to put under" or "to suppose". For a hypothesis to be put forward as a scientific hypothesis, the scientific method requires that one can test it...

, point three is that which needs to be explained, the explanandum.

Keller uses trails on a university campus (also known as a 'russian lawn') as an example: these trails are the shortest connections between the most important buildings and institutes. Their structure is much more economical and logical than the original pavements that were designed by the architect. Although it requires far less intellect to create these trails than to create the paved ways, this new system is still far more rational.
The invisible hand theory here is, according to the above pattern:

1. The motif behind the action: people tend to act on the maxim to choose the shortest path

2. Premise: the grass gradually withers on the frequently used trail

3. Conclusion: the system of trails is the unintended causal consequence of those intentional, final acts aiming to reach certain destinations at minimal expense of time and energy

Change of meaning

A change of meaning is a special case of language change. According to Keller, words change their meaning if their usage is changed. He clarifies this by the example of the German word “englisch”.

1. Ecological conditions: in the middle of the 19th century the word “englisch” had two different meanings. The one was “angelic”, the other was “English” in the sense of “of or from England
England
England is a country that is part of the United Kingdom. It shares land borders with Scotland to the north and Wales to the west; the Irish Sea is to the north west, the Celtic Sea to the south west, with the North Sea to the east and the English Channel to the south separating it from continental...

”. This started to cause problems when cultural processes led to an increased usage of the latter: now it was ambiguous whether the speaker was talking about an angelic woman or a woman from England.

2. Dictum of action:

a) Make sure you are not misunderstood

b) Make sure you are understood
(These two are not identical: in the late 19th century, using the word “englisch” for angelic would be understood, but might be misunderstood; while nowadays this speaker would not be understood at all, because the word “englisch” has lost its former meaning.)

3. The invisible-hand-process: in order to avoid misunderstandings, speakers use different, unambiguous synonyms and avoid the ambiguous expression. The ambiguous form falls into disuse, and thus is not acquired by the following generation of speakers.

4. The explanandum: the causal consequence is that in present-day German, the word “englisch” has only one meaning, “English”, and different words exist for “angelic”.
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