Their general negotiation style is aggressive bluffing
The New York style means everything is negotiable.
In general, it's interesting to me, when talk touches on regional American differences. There's this famous tech investor, Paul Graham, and he runs a personal website where he's been publishing essays for the last twenty years. One of the essays is about American cities:
paulgraham.com/cities.html
For Graham, the message from NYC is:
"New York tells you, above all: you should make more money. There are other messages too, of course. You should be hipper. You should be better looking. But the clearest message is that you should be richer."In New York, money is God.
In Boston, the message is "You should be smarter". This is the influence of all the universities - MIT. Harvard, etc. The same to a degree in San Francisco.
In LA the message is, "You should be more famous."
In DC the message is, "You should be more connected."
But coming back to New York... I think for a real New Yorker there never exists such a concept as a "definite refusal". "No" means "maybe", and "maybe" means "yes". New York despises weakness, and it tramples over the meek.
In that sense, Trump is very New York.