On the one hand people like to work their entire working life at one place, on the other hand people prefer to work for different organisations. Both views are correct at some point but I think that working conditions depends a lot where you live and what your job is.
The certain living circumstances can force a person to work only in one company or change them throughout their working life. For example, in my country, if a person lives far away from big cities or lives in a minor city, he does not have a lot of choices where to work. And this situation applies a lot of restrictions to a person.
But all things change when a person lives in a big city or even a capital. In these conditions the person has a lot of varieties where to work, how to work and so on. And some people start changing organisations a lot. Even more, there is a job that specifies on changing orginisations. For example, the person made his own business and to make this business work properly he hires a person that makes his business perform correctly and then gets paid and leaves. This type of work forces a person to change organisations.
In conclusion, a lot depends on a person itself, conditions and lifestyle. There are no advantages or disadvantages, everything depends on a person. 
On the one hand  
people
 like to  
work
 their entire working life at one place,  
on the other hand
  people
 prefer to  
work
 for  
different
 organisations. Both views are correct at  
some
 point  
but
 I  
think
 that working conditions depends a  
lot
 where you  
live
 and what your job is.
The certain living circumstances can force a  
person
 to  
work
  only
 in one  
company
 or  
change
 them throughout their working life.  
For example
, in my country, if a  
person
  lives
 far away from  
big
 cities or  
lives
 in a minor city, he does not have a  
lot
 of choices where to  
work
. And this situation applies a  
lot
 of restrictions to a person. 
But
 all things  
change
 when a  
person
  lives
 in a  
big
 city or even a capital. In these conditions the  
person
 has a  
lot
 of varieties where to  
work
, how to  
work
 and  
so
 on. And  
some
  people
  start
 changing organisations a  
lot
. Even more, there is a job that specifies on changing orginisations.  
For example
, the  
person
 made his  
own
 business and to  
make
 this business  
work
  properly
 he hires a  
person
 that  
makes
 his business perform  
correctly
 and then  
gets
 paid and  
leaves
. This type of  
work
 forces a  
person
 to  
change
 organisations. 
In conclusion
, a  
lot
 depends on a  
person
 itself, conditions and lifestyle. There are no advantages or disadvantages, everything depends on a  
person
.