>>>
>>>Yes, I knew that... Thanks for the further explanation...
>>>It's interesting for me to find out the Russian/English proverbs analogues. Now, the question is: which culture invented this first?
>>
>>
>>Probably the Huns! They were into horses, right?
>
>Could be the Gypsies (aka Roma). There are two general professions among them - musicians and horse traders. Though I have seen the latter becoming used car dealers.

Also scrap metal trading.