Or will it make no difference?

There are many markets. Much offers and much demand means more liquidity.
For every buy there is a sell. So more traders or "better traders" are making
the market more liquid but NOT behaving differently.
One can find a lot of literature on this topic starting with Adam Smith's first
view on open markets theory up to very recent writers.

GFIs1

GFIs1 

There are many markets. Much offers and much demand means more liquidity. For every buy there is a sell. So more traders or "better traders" are making the market more liquid but NOT behaving differently. One can find a lot of literature on this topic starting with Adam Smith's first view on open markets theory up to very recent writers. GFIs1

Thanks for your post, I know this is a very vague question and I appreciate the answer. Do you have a specific or favorite book of his in mind?

No need to (re-)read all of the old economist forethinkers.
Some recent reflections on theories might help further.
A very interesting article you can download here:

Financial conventions in Keynes's theory: the stock exchange | David Dequech - Academia.edu

Only in german there is a standard book for economists learning market theory:
Definition Informationsökonomik / Markttheorie | Gabler Wirtschaftslexikon

GFIs1