Question: Has there ever a period in history when people were nice to each other and not killing each other?

In other words, since humans arrived, have the inhabitants of this planet ever enjoyed ***world peace***?

To answer this, we first have to define *period*. Let's define *period* as a minimum of 50 years. If there are any periods of time without records, we will have to ignore those periods.

Now let's define *not killing each other*. By this, I mean no known battles, wars, or genocides on planet earth. I'm not referring to individual acts of violence.

*As a curious side note, with over 5,000 questions asked on this StackExchange site, this is the first question to ever implement the [peace](/questions/tagged/peace "show questions tagged 'peace'") tag. Well... almost... I just realized that I don't have enough rep to create a new tag, so perhaps a moderator will be kind enough to add it.*

Answer: 
**Company vs Design Bureau**

It's important to distinguish between a company and a design bureau. Organisations such as MiG (Mikoyan-and-Gurevich Design Bureau), Yakolev (JSC A.S. Yakovlev Design Bureau), Tupolev (OKB-156 or Tupolev Design Bureau) and Sukhoi (OKB-51 / Sukhoi Design Bureau) where, as the names suggest, "design bureaus." They designed aircraft, but did not manufacturer them.

**Outsourced Manufacturing**

Manufacturing was handled by separate state-owned factories, often more than one, and was quite disconnected from the design process.

So MiG might design an aircraft in response to a design request or competition from the air force (i.e. the soviet government), and then a number of factories around the USSR would be spooled up to manufacture the parts and assemble them into working aircraft.

**Internal Competition**

The different design bureaus, as @sds commented, competed each other to win design competitions set forth by the government as a form of internal competition. Just like a modern company might have subsidiaries or departments compete internally for work, because it drives efficiency and/or innovation.

**Specialisation**

In addition, the bureaus tended to have their own specialities (fighters or bombers or civil aircraft, etc.), and were often personality driven by the name/s behind them. E.g. Mikoyan was a well respected engineer within the USSR and he headed MiG. He was also Sukhoi's mentor, and the latter eventually left MiG and founded his own design bureau.

**Post-USSR**

In Russia's modernised economy, some of the design bureaus successfully transitioned into corporations. For example, Sukhoi is now a privately-owned company (fully owned by United Aircraft Corporation) which designs and manufactures military and civil aviation aircraft.
hmm, 

The country here is not really important. This happens in USA and other countries that want to support aircraft builders.

From what I remember from MIG / Sukhov / Illushin documentaries, they always competed between each other.

BUT, MIG and SU from 60s until now started to make DIFFERENT types of fighters made for different purposes.

Example could be:

Su-27 - MIG-29
Su-35 - MIG-35

Both are fighters, but SU-35 is a heavy fighter and MIG is light fighter. Both have their own separate purposes.

USSR and Russia support their manufacturers so that those important industries dont die and start selling bicycles like it was in 90s.

Russia right now is 2 in arms sales(27% of world sales) - building high technology products nets a big buck.