How are the core and peripheral tiers changing?

Many economists would argue that there is no such thing as perfect competition in the real world. What limitations to that theory would support their argument?

How to identify the differentiation factor from our competitors.

In your own words/don't copy from the internet write 800 word How do firms contribute to the efficiency of the market economy in ways that networks of independent contractors do not? Use your organization, or one with which you are familiar, to illustrate your response.